Posted by **sunny** on Monday, January 11, 2010 at 5:45pm.

if i forgot the product of 9 and 9 what can i do to figure it out

- math -
**Ms. Sue**, Monday, January 11, 2010 at 5:47pm
Add nine 9's.

Or remember that ghe digits of any multiple of 9 add up to 9.

9, 18, 27, 36, etc.

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