Question

What is the unknown fraction?

three tenths plus blank equals sixty one hundredths

A. thirty one hundredths

B. fifty eight hundredths

C. sixty four hundredths

D. one hundred and twenty two hundredths

Answer 1

A. 31/100

Explanation:

Change 3/10 to hundreds:

3/10 × 10/10 = 30/100

The denominator (the bottom number) must be 100.

61 - 30 is 31.

The missing number is 31/100. See image.