Ten percent of 640 is what number? a. 64 b. 128 c. 160 d. 230

Hello!

To find 10% of 640, you'll need to convert 10% into a decimal. You can do this by moving the decimal place to the left twice to get 0.10. After you need to multiply 0.10 with 640. Once you've done that, you'll have 64 as your answer.

I hope this helps!