Maths Puzzles with Answers for Kids. Year of Birth

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Here's one more cute maths puzzle with answer for Kids — Year of Birth.

Subtract from the year of your birth the sum of its 4 constituent figures. Wherein you'll have the number which is divided by 9.
Why is it so?

You'll find the answer in comments.

Comments (1)

The answer to the Puzzle:
Let m, c, d and u be the 4 figures that make up the year of your birth. Then the year of your birth may be written as 1000m + 100c + 10d + u. If you subtract from here m+c+d+u, you'll have 999m + 99c + 9d = 9* (111m+11c+d). And this number is obviously divided by 9.
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