Question

9 x 13 = ? Consider this as
10 x 13 = 130 Now remove 13 from this.
130 – 13 = 117
Note:It is easier to round the number to 10 here and multiply that with 13. Now your problem becomes easier to solve.

11 x 12 = ? Consider this as
10 x 12 = 120 Now add 12 to this.
120 + 12 = 132
Note:It is easier to round the number to 10 here and multiply that with 12. Now your problem becomes easier to solve.



Use this strategy to solve the following:




i. 8 x 12 =





ii. 9 x 15 =





iii. 11 x 13 =





iv. 12 x 15 =





v. 21 x 9 =

vi. 18 x 12 =





vii. 17 x 6 =





viii. 24 x 14 =





ix. 39 x 16 =





x. 6 x 9 =

pls show equatio too

Answer 1

Answer:

i 8× 12= (10-2)×(10+2)

now use simple multiplication like this:-

10×10 +2×10 -2×10 -2 ×2

= 100 +20 -20 -4

96