51
Multiplication
Example 1:
Anil wants to buy 14 balls each costing Rs 35. Let us help him pay for the balls.
Solution:
1 ball costs Rs 35
14 balls cost 14 x Rs 35 or Rs 35 x 14
We know that 14 = 10 + 4.
14 x 35 can be represented as follows:
35 35 35 35 35
35 35 35 35 35
35 35
35 35
10 x 35
4 x 35 140
350
490
T U
3 5
1 4
x
1 4 0
+3 5
4 9
0
0
35 x 4
35 x 10
OR
35
14
x
(10 + 4)
(10 + 4)
35
4
x
140
35
10
x
350
4 7
2 3
x
1 4 1
+ 9 4
1 0 8
0
1
47 x 3
47 x 20
Example 2:
(20 + 3)
2
+
Tip: Multiplication of a 2-digit number by a 2-digit number
Thus, total cost = Rs 490
4 7
2 3
x
Work out: