Addition fact family triangles with missing numbers worksheets

What is on this worksheet

Six triangles, each with two parts and a total of 20 or less, where every fact has one number missing for students to find, a step up from writing the answer.

• The boxes ask for: A missing number (harder)

You can change any of these settings above. Press "New problems" for a fresh set with the same settings, or pick Version A to Z to print different sheets for neighboring desks. The answer key always matches.

About fact family worksheets

Each triangle holds three numbers that belong together, such as 4, 9 and 13. Students write the four facts they make (4 + 9, 9 + 4, 13 − 4, 13 − 9), or find the number missing from each fact.

Choose addition and subtraction families (sums up to 10, 20, 50 or 100) or multiplication and division families (factors up to 5, 9 or 12). The worked example is built from your settings and the answer key fills in every box.

Printing

US Letter or A4, portrait: choose your paper size above. Print at 100 percent (actual size). Use "Black and white" for the copier, or "Color" for display pages and mini books.