Question

A whole number is added to a number with two digits after the decimal point. To make sure the answer is reasonable, how many digits should the sum have after the decimal point?

A none
B 1
C. 2
D. infinitely many

Answer 1

The sum should have 2 digits after the decimal point.

Step-by-step explanation:

When adding a whole number to a number with two digits after the decimal point, the sum should have 2 digits after the decimal point.

This can be understood by considering the rule for addition and subtraction, which states that the answer should have the same number of decimal places as the number with the fewest decimal places. In this case, the number with two digits after the decimal point has the fewest decimal places, so the sum should also have two digits after the decimal point.

For example, if we add 3 to 5.78, the sum is 8.78, which has two digits after the decimal point.