Question

How do you round 3.99 to the nearest tenths?

Answer 1

3.99 = > 3 + 0.99

first let's round up the 0.99, and the 9 rounds up to 1.0  so 0 + 1.0 = 1.

3 + 1 = 4, rounded up.

to the nearest tentth, 4.0.

the .0 simply means 0 tenths, since it's a whole 4.