Rounding Decimal Numbers: Learn the Halfway Benchmark 5-94
Find the midpoint between 2 adjacent tenths or hundredths. What number is halfway between .1 and .2? The distance between .1 and .2 is .2-.1 = .1. 1 tenth doesn't divide easily by 2, but 1 tenth is 10 hundredths and half is 5 hundredths or .05. The midpoint between .1 and .2 is .1 + .05 = .15. It's also .2 – .05 = .15.
