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Question
Work out the following multiplication.
12345679
× 9
Use the result to answer the following question.
By what number should 12345679 be multiplied to get 888888888?
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Solution
12345679
We have, × 9
111111111
Here, we observe that in the product all the digits are same i.e. 1, which is actually the unit digit of the product 9 × 9. Also, total of digits in the multiplier is 90°.
We have, to obtain the number 8 in the product, we should multiply the given number 12345679 by 72 as sum of its digits is 9 and 2 × 9 has only digit as 8.
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