Add the numbers.
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Free printable missing number addition and subtraction worksheets for first grade. Find unknown starts, addends, and subtrahends within 20.
Grade 1 · unknowns in addition and subtraction. This printable activity gives children something concrete to count, color, draw, cross out, match, or explain. It provides focused practice for 1.OA.A.1; 1.OA.B.4; 1.OA.D.8 and a matching answer key for the exact generated set.
The unknown appears in several positions instead of always at the end. Learners find a missing addend, starting amount, or amount taken away and can check it in the original equation.
Use counters or a related subtraction fact when needed. After finding the unknown, substitute it for the box and read the complete equation to confirm that both sides match.
Read the first direction together and let the child complete the physical action before writing a number. Ask, “How do you know?” after one item. That short explanation reveals whether the picture, model, and equation make sense together. Use crayons, a pencil, small counters, or a straightedge when the activity calls for them.
Select New problems to make a fresh set with new numbers or pictures. Switch between Worksheet and Answer key to preview both pages. The selected worksheet and answer key use the same set, so every answer stays aligned. Choose either page or both in the print controls, then print on US Letter or A4 paper. A browser print dialog can also save the activity as a PDF.
The worksheet is free for home practice, tutoring, and classroom use. Begin with a level the learner can complete accurately, then generate a new set for another short session. Hands-on work should support mathematical thinking, so accuracy and a clear explanation matter more than speed.
□ + 4 = 10.
Generate, preview, and print the worksheet with its matching answer key.