DrillGrades 1 to 2Grades 3 to 4
Addition worksheets
Printable addition practice with control over digits, regrouping and layout.
Sum triangles
Triangles where each side is the sum of the two circles it joins, to fill in by adding or by working back.
About this worksheet
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.
Popular versions
Ready-made settings for common topics.
- Addition within 20 sum triangle puzzles
- Missing circle sum triangle puzzles
- Harder missing circle sum triangle puzzles
- Mixed circle and side sum triangle puzzles
- Harder mixed circle and side sum triangle puzzles
- Adding integers sum triangle puzzles
- Missing integer sum triangle puzzles
- Mixed integer sum triangle puzzles
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