Ms. Gillespie is comparing the average score on the final math exam in her eighth grade class to the school average score. Her class average is 78.6854 percent. What is this percent rounded to the nearest tenth?

A. 78.8

B. 78.5

C. 78.6

D. 78.7

D. 78.7

Step-by-step explanation:

To round this to the nearest tenth, first find the digit in the tenths place. This is 6.

Next we look at the digit behind the tenths. If this digit is 5 or more, we round the tenths place up. If the digit behind is 4 or less, we leave the tenths place alone.

The digit behind the tenths place is 8; this means we round the tenths place up. This gives us 78.7.

tenth is the first place after the decimal so we need to look at the 2nd place after the decimal to know where to round (hundreths) If it is 5 or greater the tenths place goes up.

78.6854 we look at the 8 (it is greater than 5) so it rounds to 78.7