Mixed circle and side sum triangle puzzles

What is on this worksheet

Some circles and some sides are shown, and students use the rule that each side is the sum of its two circles to fill in the rest; sides up to 10.

• What students find: A mix of circles and sides

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 sum triangles

Each triangle has three circles and three side boxes. A side is always the sum of the two circles at its ends. Younger children add the circles and write each sum. Older children are given the sides, or a mix of circles and sides, and work out the rest.

Every triangle has exactly one answer. Choose sides up to 10 for early addition, sides up to 20 for first and second grade facts, or negative numbers for students meeting integers.

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.