If you forget the product of 9 and 9, what can you do to figure it out?

1. 0
2. 7
1. Use 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.

posted by Ms. Sue
2. pillow

posted by uw

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