100000 divided by .0312

Question

My 5th grader has this problem coming up on his math test. They can not use calculators....how would he go about solving this problem.

100,000 divided by .0312 = ?

Answer 1

0.0312 is close to 0.03125=1/32 so the answer is close to 32*100000=3,200,000. (The more accurate answer is 3,205,128 approx.) I think that's the way he was expected to answer without using a calculator. It's also possible that he was expected to use long division. I'd go for the simplest explanation: 0.0312 is close to 1/32 so dividing by 1/32 is the same as multiplying by 32.