Std 3 Maths SCERT [Let's takeaway]

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 CHAPTER 3

Let's Take Away





Recall


*When one number is subtracted from another member the Difference is obtained

 *While subtracting, the smaller number (Subtrahend) is taken away from the bigger(Minuend).

*The symbol for subtraction is "ー"


Example


The difference between 857 and 642 is 215 can be as follows 


857      ー     642       = 215

 ⬇                  ⬇                ⬇

Minuend       Subtrahend         Difference


The numbers are written  one below the other according to the place value of their digits



*The digits are subtracted starting from the units place.

*Subtraction of numbers may or may not involve regrouping .

*Subtraction can be checked or verified using addition

Difference + Subtrahend=Minuend

Example 

8         -        2      =       6

⬇                  ⬇                ⬇

Minuend       Subtrahend         Difference  

6+2=8



Different number patterns can be obtained by skip counting backwards

Examples In 10's :

400, 390, 380, 370

In 50's :

850, 800, 750, 700


Subtracting 3-digit numbers without borrowing


Ex : Subtract 627 from 262

   

  667-223


     687-

     323

  ----------

    364


Step 1: Subtract the ones

 7 ones- 3 ones = 4 ones

Write 4 in the ones place.


 Step 2: Subtract the tens

8 tens-2 lens = 6 tens

 Write 6 in the tens place.


Step 3: Subtract the hundreds


6 hundreds - 3 hundreds = 3 hundreds

 Write 3 in the hundreds place.


Exercise 1

1.354-123

2.635-223

3.765-323


Subtracting 3 digit numbers with borrowing

ex:567-228

     567-

     228

  ------------

    339


Step 1: Subtract the ones

you cannot subtract 7 ones from 8 ones. Borrow 1 ten from 6 tens and change it to 10 ones.

You now have 17 ones

17-8=9

write 9 in the ones  place.

Step 2: Subtact the tens

5-2=3

write 3 in the tens place.

Step 3: Subtract the handreds

5-2=3

Write 3 in the hundreds place.


Exercise 2

1.347-228

2.623-314

3.572-258








Notes with mother


Four 100 rupee note+five 

10 rupee notes 

400+50=450 rupees.


What are the notes given to Anu?


One 100 rupee note and two 10 rupee notes.

 100+ 10 + 10 = 120 

Money left with Anu's mother

Three 100 rupee notes and three 10 rupee notes.

100+ 100+ 100 = 300

 10+ 10 + 10 = 30 

(300 + 30= 330 rupees]

450-120 =330


450 120= 330























India=243 runs

opposite team = 193 runs

:. More runs India

 scored =243-193=50 runs





*Of the 686 grains that the tiny ant collected, he gave 247 to the baby squirrel and 265 to the pretty parrot. How many grains are left with the tiny ant?


Total number of grains given to baby squirrel and pretty parrot 247 +265 = 512


grains left with tiny ant = 586-512 = 174



























 Number of boys participated in the Independance day 

rally = 296


Number of girls = 336


Total = 296 +336= 632


Total number of Scouts


and Guides = 186 +117=363


Number of Red cross members= 632 - 363 = 269











Number of persons took food on the first day = 386

Number of persons took food on the second day = 637

 More persons took food on the second day. To know 'how much'?◻ find how much more is 637 than 386.

637-

386

------

251

No. of chairs hired = 1000 

No.of chairs returned = 186 No. of chairs used = 1000-186

1000-186=814









[page 44 of the text book]


1)Among the 240 notebooks with the school society, half of them were sold. Find the number of notebooks left.


 *Total number of notebooks = 240 

Half of it were sold. 

So half of it is left.

 Half of 240=120


2)Ramu bought brinjal for 545 rupees and lady's finger for 232 rupees. He sold the brinjal for 637 rupees and the lady's finger of 365 rupees. Find the profit from each sale. What was the total profit? 

Profit on selling the

 brinjal = 637-545 = 92 Rs

Profit on selling the lady's finger = 365-232= 133 Rs


Total profit = 92 +133=225 Rs


3)Ammu bought some household things from Babu store for 903 rupees. Anu bought the same things from Maveli Store for 784 rupees. Which is the best purchase? By how much?


The best purchase is that from Maveli store, because the price is less there. 

Gain on purchase from Maveli store=903-784=119 RS


4)PTA bought 8400 laddus for the In dependence Day celebrations. The number of students in the first stan dard is 89, second standard 93, third standard 87, fourth standard 98 and in the fifth standard 102. If one laddu is given to each student, find the number of laddus left. Find the num ber of laddus needed more to distrib ute two laddus each two every student. 

Total no.of students=89+93+ 87 +98 + 102 = 469

 No.of laddus bought = 840

 No. of laddus left if given one each = 840-469 = 371

 No. of laddus needed to give two each=469 +469=938

More laddus needed=

938-840 = 98


5)In a UP School, the number of students in the LP section is 292 and 345 in the UP section. Among them 349 are boys. Find the number of girls in the school. Who are more in number, boys or girls? By how much?


Total no.of students = 292 + 345=637 

No of boys = 349 

No. of girls = 637-349 = 288

 Boys are more in number.

 No.of more boys = 

              349 - 288 = 61


840-785=55
840-435=405
840-518 =322
840-695 =145
840-378 =462
785-435=350
785-518=267
785-695=90
785-378 = 407
695-435=260
695-518 =117
695-378 =317
518-435=83
518-378 = 140
435-378 = 57
















Manian rat can escape through the number 322 on the well





















By finding the answers to the questions on the keys we can find the locks

699-398 = 301

765-499=266

702-208=494

Find the locks by doing the sums on the keys

526-149=377

689-496=193


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കുട്ടികളും പക്ഷികളും പകരം പദം കിടച്ചീടുക = കിട്ടുക ഞായം = ന്യായം ഉള്ളം = മനസ്സ് മെയ്യ് = ശരീരം ചന്തം = ഭംഗി പൂതി =ആഗ്രഹം സാഹസം = ധീരപ്രവൃത്തി മതിർക്കുക=മധുരിക്കുക കണ്ടെത്താം എഴുതാം * മഞ്ഞയുടുപ്പിൽ കരിയുമായി - മഞ്ഞക്കിളി * മെയ്യാകെ വെള്ളയായ് - പ്രാവ് * കൂരിരുട്ടിൻ്റെ കിടാത്തി - കാക്ക * മാരിവിൽ ചേലൊത്ത പക്ഷി -മയിൽ * പച്ച സുന്ദരി -തത്ത * ഓട്ടക്കാരൻ പക്ഷി - ഒട്ടകപക്ഷി * തയ്യൽക്കാരൻ പക്ഷി - തുന്നാരൻ വരികൾ കണ്ടെത്താം * മഞ്ഞക്കിളിയെ കണ്ടാൽ മധുരം തിന്നാം "മഞ്ഞക്കിളിയാണു കാണുകിൽ നമ്മൾക്കു മധുരം കിടച്ചിടുമെന്നു ഞായം" * കൃഷി കുറഞ്ഞു വരുന്ന അവസ്ഥ " നെല്ലരിയില്ലല്ലോ നമ്മൾക്കുറേഷനാ- യുള്ളരിയിത്തിരി കൊണ്ടു നൽകാം" * പക്ഷിയെ പിടിച്ചു വളർത്താമെന്ന കുട്ടിയുടെ ആഗ്രഹം "എട്ടാ നമുക്കു പിടിച്ചു വളർത്തിടാം കൂട്ടായി നമ്മൾ ക്കിണങ്ങുകില്ലേ?" പക്ഷിച്ചൊല്ലുകൾ * കാക്കക്ക് എന്തിന് കറുത്ത കുപ്പായം * കാക്കയ്ക്കായുസ് കോഴിക്കഴക് * ചക്കിനു വച്ചതു കൊക്കിനു കൊണ്ടു. * കുഞ്ഞി പക്ഷിക്ക് കുഞ്ഞിക്കൂട് * ഇണങ്ങിയ പക്ഷി കൂട്ടിൽ, ഇണങ്ങാത്ത പക്ഷി കാട്ടിൽ * കാക്കയും വന്നു പനമ്പഴവും വീണു. * കുയിൽ പാടുന്നത്...
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Std 3 English [SCERT Lesson 2 Three Butterflies]

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Lesson 2 New words butterflies garden sacked nectar difficult seeking curiously shelter heavily favourite fellows pebbles petals wide begged dismay chased write the 'ing' form and past tense write plurals Garden __Gardens Butterfly__Butterflies Friend___  Friends Petal___ Petals Sunflower ___Sunflowers  Rose___ Roses Lily  ___Lilies Write opposite Suddenly___Gradually Stop ___ start Cold ___ Hot Wet ___dry Difficult___ easy Find ___ lose Over___under Like___ dislike Wide ___ narrow Hide___Reveal Favourite ___ unfavourite Friend___ enemy Cloudly___cloudless Let's make many words from the word "Butterfly" fly, butter, but, tub,free, yet etc... Read and rearrange the sentences in a proper way *Together, they sucked necter from the flowers. * One was white one red and one yellow  * Three butterflus lived in a garden *They played together *They were friends.  *They danced together • Three butterflus lived in  garden • They were friends. • One was white one red a...
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std 4 EVS SCERT [Lesson 6 Up above the sky]

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  Lesson 6 Up above the sky [1st  day-4/2/2021] 1.why is the moon light not hot? *The sun is a star that gives out heat and light of its own. But moon can't do that. It only reflects the sunlight that falls on it. 2What is a star? *stars are heavenly bodies that shine in the sky. 3.Sun is a ------ *star 4.--------is a star that gives out light of its own. *The sun 5.What is a planet? *Planets are heavenly bodies in the sky that revolve around the sun along a definite path. 6.Name the planets in Solar System. *Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune 7.What is Satellite? *Satellite are heavenly bodies that revolve around planets. 8.-------is the only satellite of the earth. *The moon 9.what is rotation? *The spinning of the earth on its own axis is called rotation. 10.What is revolution? *The movement of earth around the sun is called revolution. 11. How do occur day and night in the earth? *As the earth rotes on its axis, and the part of the earth on which...
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Std 4 EVS [SCERT The Leaf too has to say]

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 Lesson 2 The Leaf too has to say 1. What are the parts of a plant? 2) How many types of root system? what are they? *Two types taproot system, fibrousroot System 3. what is taproot system?  * The taproot system consists of the larger tap root and the smaller branches growing from it 4. what is fibrous root system?   *The fibrous root system includes a cluster of similar roots growing from the base of the stem 5. what are the difference between taproot System and fibrous root system? 6 what is reticulate venation?  *The net work like venation in leaves is called reliculale venation 7. what is Parallel venation?  *The Parallel arrangement of veins in leaves is called Parallel venation 8. What are the difference between reticulatevenation and parallel venation? Activity 1 Remove the green colour in leaves and make an album Activity 2 collect and trace different types of leaves 9. Complete the table 10.write the relation between the root system and venation? *...
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std 3 Maths SCERT [Lesson 7 In Rows and Columns ]

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  Lesson 7 [In Rows and Columns ] Recall *Repeated addition of the same number is multiplication *The result of multiplication is called Product Multiplicand X Multiplier = Product * Multiplication tables can be constructed by repeated addition Table of   7 1x7=7 2x7=14 3x7=21 4x7 = 28 5x7 = 35 6x7=42 7x7=49 8x7=56 9x7=63 10x7=70 Table of 8 1x8=8 2x8=16 3x8=24 4x8=32 5x8=40 6x8=48 7x8=56 8x8=64 9x8=72 10x8=80 Table of 9 1x9=9 2x9=18 3x9=27 4x9=36 5x9=45 6x9=54 7x9=63 8x9=72 9x9=81 10x9=90 Table of 10 1x10=10 2x10=20 3x10 =30 4x10=40 5x10=50 6x10=60 7x10 =70 8x10 =80 9x10=90 10x10 =100 *when two numbers are multiplied in any order their product remains the same. Match the following *when any number is multiplied by 1, the same number is obtained as the product. Ex: Number x 1 = Product 7x1=7 100x1=100 567x1=567 *when any number is multiplied by 10, in the product, one O (Zero) is written to the right of the number. Ex: 8x10=80        25x10=250   Do...
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Std 3 SCERT Maths [Lesson9Equal shares]

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  Lesson 9 Equal shares *Division is repeated subtraction of the same number *Division is also equal grouping and equal sharing. *The number which gets divided in called divident *The number which divides the divident is called divisor *The result of division is called quotient *The number which is left undivided after division is called Remainder *The symbol for division is  ➗ Example 7÷2[7divided by 2] 7     ÷      2      =3,   1➝ Reminder ⇩             ⇩           ↓ Dividend        Divisor               Quotient * For every division fact, there is a related multiplication fact ex-10÷5=2[2X5=10]                         ↓                               Related multip...
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EVS , Std 4 Lesson 3 [The Road To Independence]

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    LESSON 3 THE ROAD TO INDEPENDENCE         1. Who was the first    foreiner to reach  India in 1498?   *Vasco da Gama   2. In which year  India got    Independence? *1947 August 15   3. When did  Gandhiji  came back  to  India from South  Africa? *On 9th January 1915 [at Apollo Banther Harbour, Bombay ] 4. which day is  observed as  pravasiday? [Non  Resident Indian day] *January 9th is  observed as  Pravasiday in  commemoration of  arrival of Gandhiji  from South  Africa 5 . What was the  condition of India  during British rule, when Gandhiji  came back from  South Africa? * The British  threatened and  killed the Indians *The British forced  the Indians to  obey all their laws *Various taxes were levied 5. Asram founded by  Gandhiji  in  Gujarat? Sabarmathi Asram 6.where is  Sabar...
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Std 4 EVS [Lesson 4 wonder world of birds]

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Lesson 4 wonder world of birds 1)Mention the names of birds seen in your locality? Ans) Crow, Parrot, duck, hen, Penguin  2)What are the common characteristics of the birds? Ans) - have feathers            -have beak            -lay eggs            -has wings  3)Observe the surroundings  and make a short note  about the birds in our  s urroundings  Ans)-Crow  Crow is the most familiar bird of Indian towns and villages.Has no particular food preferences will eat almost anything.          There are two types of crows in our surroundings. House crow[pena kakka] and jungle crow[beli kakka]. Grey neck and smaller size distinguish House crow from the all black jungle crow. Belikakka's whole body is shining black in color.Size of the beak and body is larger than House crow. 4)Where do birds build nest? Ans) In holes on the tree trunks,on the bran...
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Std 3 English SCERT Lesson 5 The Little Clay Hut

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  Lesson 5 The Little Clay Hut 1st day[ 29/3/2021] Activity 1 Draw the clay pot and write about it. what is the special about clay pot? *It is cheep. It is better for cooking. It is easily breakable. It is made of clay. Activity 2[Read the passages. page 104,105] Activity 3 [New words] village bullock cart swinging swaying humming peeped grass bed rolled green meadows empty Activity 4[Project work. Page 123] Collect the different types of house.Paste them in your notebook. 2nd day Read the following passages loudly Do this activity in your textbook 1.Kitchen *gasstove, fridge, knife, shelf, vessels, washbasin spoon 2.Dining room   chairs, washbasin, table, towel, soap 3.Toilet Soap, water closet, tap, bucket, mug, shower 4.Reading room bookshelf, newspaper, Chairs, books 5. Hall sofa, television, chair, computer,  tea-poy 6.Bedroom  cot, pillow, shelf, fan,mat, table 3rd day 4th day Bear: Sorry for my mistake.please forgive me. Inmates: That's all right Bear: May I s...
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std 4 SCERT EVS [Lesson8 Reading and Drawing Maps]

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  Lesson 8 Reading and Drawing Maps 1st day 1.What is a map? *The visual representation of an area or a region is called map. 2.what are the main features of a map? * - a heading which tells us what a map is about - a direction pointer which indicates the 'North' direction. - an index which tells us what each symbols stands for 3. This Symbol is used to show direction.Write the directions? *          top-North          bottom-South         right-East         left-west 4.what do the following symbols in a map represent? *   5.Let's read the map [Page:  86] *     * - It is Kerala's map -14 districts in Kerala - there are 5Airports in Kerala.[Malappuram, Ernakulam , Kannur, Thiruvananthapuram] -2Airports in Ernakulam -2 harbour in Kerala [Ernakulam, Kozhikode] - No railway in Idukki and Wayanad - Alappuzha is a smallest district in Kerala. - Palakkad is the largest district in...
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std 3SCERT Maths [lesson 10 Measuring weights]

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  Lesson 10 Measuring Weights *Weight of objects are expressed using standard units. *Devices or Instruments[weighing machines] used to measure the weight of objects are Beam balance, Spring balance, Digital balance. *Weight of different values are used to weigh objects when balancing scales are  used * measuring units of measuring weight is gram or kilo gram. *gram is smaller unit for measuring weight. *Balance is the instrument used to measuring weight. 1000 Grams=1 kilo gram or 1000g=1kg *Spring balance, common balance, Weighing machine, Platform balance are instrument to find the weight things. Weighing machine used to find our weight. Quarter kilo gram=250g Half kilo gram=500g Three forths of kilo gram =750g activity 1[How many times each measuring weight is to be used to 1 kg? Activity 2[converting kilo gram into grams] *1kg = 1000g *4kg=4000g *14kg=14000g *7 1/2kg 7kg = 7000g+ 1/2kg=500 .--------------- 7500g
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Std 4 SCERT EVS [Lesson11 Care for friends]

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  Lesson 11 Care For Friends 1.what is first aid? * First aid is the care give to a person who meet with an accident before he or she receives medical assistance. 2.what are the benifits  of first aid *To reduce the intensity on injury *To get relief toa very great extent *Victim's condition does not became  worse. 3. What are the duties of a first aid provider? *Console the victim *  provide medical assistance at the earliest *to give the possible first aid. *to inform the concern authorities 4.What is ment by first aid provider? *One who gives first aid is called first aid provider. 5.why should the first aid provider keep hands clean? *If the first aid provider does not wash his hands, there was a chance to entering germs in his body through the wounds. 6.what does we do when the wound is minnor ? *hold the wounded part high *hold the wounded part tightly with clean cloth to prevent bleeding. *Don't remove the blood clot from the injured part 7. What are the first...
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std 3 Maths SCERT [Lesson 8 Measure and Tell]

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  Lesson 8 Measure and Tell Length *Length of objects or distances are measured using different units of length. *Non-standard units of length are Span, Foot and Cubit [length of body parts]  Non-standard units of length differ from person to person or from object to object. *Standard units of length are Centimetre, metre and kilometre.Standard units of length do not change. *We measure the length of pencil, book etc are measure in  centimetre. Length of table, bench etc are measure in metre. Very long distance such as distance between two towns are measure in Kilometre. Metre Scale An instrument name for measuring length metre Scale. Metre Scale is long wooden metalic rod of fixed length. It is devided into 100 equal parts. Each part is called Centimetre. Ruler/Scale tape Relation between metre ,Centimetre and kilometre. * we use  cm for centimetre m for metre km  for kilometre 100cm = 1 metre 50cm = 1/2 metre 1000 m = 1 kilometre Activity 1 *Draw a line 9cm *D...
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