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#30265
Shikha Dhingra
Participant

Challenge question 8         21 x ?? = ?? 12

21 x 72 = 1512

explanation:

As 2 is at ones place in answer therefore one place digit in second number is 2

21 x ? 2 = ?? 12

according to crosswise and vertical method

21

?2              the digit at ? should be 7   so that (2 x 2 ) + (7 x 1 ) = 1 at tens place and 7 x2 =14  and carry 1  which is 14 + 1=15

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1 5 1 2

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