Question

) How would we multiply the numbers 13680347, 35702369 and 256923 59 with
mentally? What is the pattern that emerges?​

Answer 1

Answer:

To multiply a number with 9 we use the following trick:- The number x(10−1)

13680347×9=(13680347)×(10−1)=136803470−13600347

=123123123

35702369×9=35702369×(10−1)=357023690−35702369

=321321321

25692359×9=25692359(10−1)=256923590−25692359

=231231231

These results repeat the digits 1,2 & 3 in a cyclic pattern.

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