100 Addition Facts 1 to 20

100 Addition Facts 1 to 20

Practice 100 basic addition math facts. This worksheet practices addition math facts 1 to 20. The answer key is provided to check answers.

Using this addition facts worksheet

This page gives students one hundred single-step addition problems with sums up to 20, laid out in a tidy grid so the whole set fits on a single printout. Because every problem is a basic fact, it works well as a daily warm-up, a quick fluency check, or independent practice once children have learned to add within 10 and are moving into the teens.

For a timed drill, give students five minutes and have them circle the last problem they finished, then try to beat that number next time. For an untimed version, have students finish the page first and then check their own work with the answer key so they can spot which facts need more practice. Facts that cross ten, such as 8 + 7 or 9 + 6, are the ones most students find hardest, so watch those closely.

Three strategies are worth teaching alongside the page: make a ten first (8 + 5 is 8 + 2 + 3), use doubles and near doubles (7 + 8 is one more than 7 + 7), and count on from the larger number. When this page starts to feel easy, move on to the related addition facts worksheets listed below.