Adding 3 Single Digit Number Worksheet

Students will add three single-digit whole numbers together and correctly find sums up to 20 (page 1, problems 1-12).

Remind students before starting that every sum will be 20 or less, per the worksheet's own directions, so they can use that as a quick self-check if a total comes out higher.

Use this page for repeated fact-fluency practice, since the three-addend format gives more addition reps per problem than a standard two-addend worksheet.

Have students check their own work against the answer key on page 2 immediately after finishing, since every sum is already worked out.

Multi-addend addition -- students add three single-digit numbers in a single problem rather than the more common two-addend format.

Sum estimation within a known range -- the stated 'answer will be within 20' constraint lets students self-check their work as they go.