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
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
Comments
Post a Comment