Posted by
Alex on
.
How can you use mental math to multiply 800 x 5?

3rd grade math 
John,
8*5=40
40 add in two zeroes
to get 4000

3rd grade math 
Benjamin,
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,
How can you use mental math to multiply 800 times 5