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What if the first number is odd?

For example: 15^2 + 30^2

15^2 + 30^2 equals 1125. You just follow the same trick, so 15^2 is 225, and you divide 225 by 2, yielding 112.5, and you multiply that by 10. I think Mr. Gillespy meant that adding the zero means multiplying by 10.

Exactly. Adding zero means times 10.

What would you do in the approximate question like 14^2+48^2. Thanks

The type of question usually has a pattern like 2 times 3 times or 7 times as big are you sure its not one of those?

So what do I do if the question has the units digits add up to ten and tens digits are the same? For example: 63^2+67^2

By the blue book its all in there.

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## 8 comments

Skip to comment form

What if the first number is odd?

For example: 15^2 + 30^2

15^2 + 30^2 equals 1125. You just follow the same trick, so 15^2 is 225, and you divide 225 by 2, yielding 112.5, and you multiply that by 10. I think Mr. Gillespy meant that adding the zero means multiplying by 10.

Author

Exactly. Adding zero means times 10.

What would you do in the approximate question like 14^2+48^2. Thanks

Author

The type of question usually has a pattern like 2 times 3 times or 7 times as big are you sure its not one of those?

So what do I do if the question has the units digits add up to ten and tens digits are the same? For example: 63^2+67^2

Author

By the blue book its all in there.