Understanding decimals conceptually, using operations with decimals, rounding and estimating with decimals, and converting decimals.
See how you score on these 20 practice questions

Honestly, once you remember one very important rule, the rest of adding and subtracting decimals is a snap. That rule is to be sure and align your decimals first. In this tutorial, you'll get a chance to practice this with us and become fluent adding decimals. We'll tackle subtracting decimals in the next tutorial.