Posted by **Alex** on Tuesday, November 29, 2011 at 11:09pm.

How can you use mental math to multiply 800 x 5?

- 3rd grade math -
**John**, Tuesday, November 29, 2011 at 11:20pm
8*5=40

40 add in two zeroes

to get 4000

- 3rd grade math -
**Benjamin**, Wednesday, November 30, 2011 at 12:26pm
Just multiply 8 and 5 you will get 40 when you add two zeros you get 4000.Check your answer on paper, If you wish to

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