Addition fact family worksheets
Six triangles, each hiding four facts — addition and subtraction taught as one relationship.
Best fit: 1st–2nd grade · 8 sheets, answer keys included · Free, no sign-up
The full set: 8 worksheets with answer keys
Eight sheets in the same layout with different problems: download them as one PDF or print one at a time.
Worksheets
-
Sheet 1
-
Sheet 2
-
Sheet 3
-
Sheet 4
-
Sheet 5
-
Sheet 6
-
Sheet 7
-
Sheet 8
Answer keys
-
Sheet 1 answers
-
Sheet 2 answers
-
Sheet 3 answers
-
Sheet 4 answers
-
Sheet 5 answers
-
Sheet 6 answers
-
Sheet 7 answers
-
Sheet 8 answers
About these worksheets
The addition version of the fact-family triangle: the whole on top, two parts below, and four facts to write, two sums and two differences. Writing them together ties subtraction to addition facts the child already knows: 15 − 8 can be read as “8 and what make 15?”
Grade level: these worksheets are part of our 1st grade math worksheets collection.
Frequently asked questions
What are the four facts in an addition family?
For 7, 8 and 15: 7+8=15, 8+7=15, 15−7=8 and 15−8=7. One triangle, four facts.
How does this help with subtraction?
It reframes subtraction as a missing-part question, which is how fluent adults actually compute it — no counting backwards required.
What grade are these for?
1st and 2nd grade, alongside addition facts within 20.
Do the 8 sheets use different numbers?
Yes. Each triangle uses two different numbers from 2 to 9, so the wholes run from 5 to 17 (doubles such as 6 + 6 are left out), and no family appears twice on the same sheet. A few families come back on later sheets, which works as review.