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

3rd grade math  Anonymous, Tuesday, May 26, 2015 at 8:53pm
How can you use mental math to multiply 800 times 5
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