Free worksheets / Addition & Subtraction
Addition and Subtraction within 20
The complete within-20 unit with rockets, planets and astronauts. Pair it with the other editions for extra practice — the problems don't repeat.
3 of the 11 worksheets in color and black & white, with the answer key · 10 pages, free to print.
- Strategy reference sheet + practice + quiz
- New problems in every edition
- Answer key for every page
- Grade
- Grade 1
- Full set
- 11 worksheets in color, the same 11 in black & white, answer key · 28 pages
- Format
- PDF, US Letter (8.5 × 11 in)
- Standards
1.OA.A.1Use addition and subtraction within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions.
1.OA.B.4Understand subtraction as an unknown-addend problem.
1.OA.C.5Relate counting to addition and subtraction (e.g., by counting on 2 to add 2).
1.OA.C.6Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten; decomposing a number leading to a ten; using the relationship between addition and subtraction; and creating equivalent but easier or known sums (e.g., doubles plus one).
1.OA.D.8Determine the unknown whole number in an addition or subtraction equation relating three whole numbers.
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