How would we multiply the numbers 13680347, 35702369 and 25692359 with 9
mentally? What is the pattern that emerges?
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Step-by-step explanation: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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