Addition Within 20 Worksheets

Free printable addition within 20 worksheets as PDFs. Facts to 20 including bridging through ten. No sign-up and no email.

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Addition within 20 is a bigger jump than addition within 10, because it is the first time a child has to cross a ten. Adding 8 and 3 is not a matter of counting on if you want it to be fast — it is 8 plus 2 to make ten, then one more. These sheets give plenty of practice on the facts that do not cross, so confidence stays high, and then concentrate deliberately on the ones that do, since those are the facts that decide whether mental arithmetic ever becomes fluent.

Addition facts within 20 in both horizontal and vertical formats, sheets that separate the crossing-ten facts from the rest, missing-addend rows where the total is given, and a few pages using ten frames or number lines to show the bridging step. Layouts are open with generous spacing. One worksheet per US Letter page, black and white.

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Frequently asked questions

What does bridging through ten mean?
Splitting the second number so you land on ten first. For 8 plus 5, take 2 from the 5 to make 8 into 10, then add the remaining 3 to get 13. It is faster and more reliable than counting on, and it is the strategy most curricula want established before larger addition begins.
Should children still be counting on their fingers?
At this stage many do, and it is not a problem in itself — it becomes one only if it stays the only method. The aim is to move from counting to recall, and targeted practice on the crossing-ten facts is usually what makes that shift happen.
Which facts within 20 are hardest?
The ones that cross ten with two larger addends — 7 plus 8, 6 plus 9, 8 plus 9. Doubles and near doubles like 7 plus 7 and 7 plus 8 are often easier than they look if the doubles are known, so teaching doubles first tends to pay off.
What age is addition within 20 for?
As an editorial guide, roughly ages 5 to 7. It usually follows addition within 10 and number bonds, and it comes before two-digit addition with regrouping, which relies on the same bridging idea at a larger scale.