std 3 Maths SCERT [Lesson 7 In Rows and Columns ]

 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 this activity


 

   




2nd day [ 13/3/2021]

Multiplication by 'zero'[0]

Any number multiplied by 'Zero' (0) is Zero.

ex:9X0=0

      0x10=0


Multiplication by 100

To multiply a number by 100 write two zero on the right side of that number.

ex:9X100=900

     34X100=3400

Multiply two digit number and one digit number.

21X3


X







Write 21 and 3 as shown above. 3 is write under the ones place of 21.Multiply the digit in the ones place. That is multiply  1 by 3 
(1X3=3). There are 3 write in ones place. Then Find multiply 10's Place.[ 3X2=6]6 write in tens place Answer is 63

Find out
*24X2
*22X3
*21X4
*11X5





1.83X3

83X     3X3=9
  3         8X3=24
------
249

2.26X4

26X     6X4=24
   4        2X4=8+2=10
-----
104
       








*Total Price=15X8
   
  15X
    8
  -----
  120












1.14 X 12


    14X             4X2 = 8

    12                  1X2=2

    ------               1X4=4

     28  +              1X1=1

  14

-------

 168



2.43X23


      43X       3X3=9

      23          4X3=12

   ----------      3X2=6

      129   +      4X2=8

      86

------------

      989


Answer

1X3X12

4X3X3






15 X 
20


      15 X   5X0=0
      20       1X0=0
      ----      5X2=10
      00 +        1X2=2+1=3
    30
---------
   300






    

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