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First you just multiply 8 by 5, which is 40. Tack on two 0's at the end to get 4000.

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

First take out the 2 zero's. then you have 8x5. Multiply then add the 2 zero's. now you have 8500 which is the answer.


How can you use mental math to multiply 800 x5?

yes you can just multiply the 8 and the 5 then add all the zeros you have in the 800 to your answer. EX. 8x5=45 <-- your answer then add the 2 zeros your final answer is 4500


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