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Posted by **Alexandra** on Thursday, January 13, 2011 at 5:30pm.

- Math/3rd grade -
**Ms. Sue**, Thursday, January 13, 2011 at 5:39pmUse a calculator.

Or better yet -- remember that the digits of the product or 9 times any number will always add up to 9.

18, 27, 36, 45, 54, 63, 72, 81, 90

Another way is to multiply 9 * 10 = 90 and subtract 9 from 90.

- Math/3rd grade -
**uw**, Wednesday, January 26, 2011 at 6:37pmpillow

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