Question

how would we multiply the number 13680347,35702369,25692359 with 9 mentally? what is the pattern that emerges.​

Answer 1

Answer:

By checking divisibility.

Step-by-step explanation:

Divisibility of nine is is checked by adding the sum of the digits of the number and then checking if this sum is divisible by 9.

HERE,

1+3+6+8+0+3+4+7+3+5+7+0+2+3+6+9+2+5+6+9+2+3+5+9 = 108.

Now, we know that 108 is divisible by 9

(108÷9 = 12).

Hence , 136803473570236925692359 is divisible by nine and can be easily identified mentally

Hope it helps :)