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Question
Work out the following multiplication.
12345679
× 9
Use the result to answer the following question.
What will be 12345679 × 63?
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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 compute the value of 12345679 × 63.
Here, sum of the digits of the multiplier is 9 and unit’s digit of the product is 9 and unit’s digit of the product of 3 × 9 is 7.
∴ 12345679 × 63 = 777777777
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