Grade 1 Addition worksheets
Adding small numbers with sums up to 10, then up to 20, plus equations where one addend is hidden, such as 3 + ___ = 8.
- Addition within 10
Related standards: 1.OA.C.6
- Addition within 20
Related standards: 1.OA.C.6
- Missing addends
Related standards: 1.OA.D.8
How the skills build
Addition within 10 comes first, where Challenge leans on near-ten facts. Addition within 20 follows, and Missing addends connects addition back to subtraction.
Using these worksheets
- Warm-up
Two minutes of Addition within 10 at Easy makes a calm lesson opener; the answer key lets children check their own work.
Related standards
- 1.OA.C.6: Add and subtract within 20.
- 1.OA.D.8: Find the unknown whole number in an addition or subtraction equation.
Common Core–informed practice; not a claim of official alignment.