Add the numbers.
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Free printable fact family worksheets for first grade. Use part-part-whole houses to write related addition and subtraction equations within 20.
Grade 1 · related addition and subtraction facts. This printable activity gives children something concrete to count, color, draw, cross out, match, or explain. It provides focused practice for 1.OA.B.4; 1.OA.C.6 and a matching answer key for the exact generated set.
A fact house keeps two parts beneath their whole. Learners use the same three numbers to write two addition and two subtraction equations, or find one missing house number first.
Read the roof as the whole and the lower rooms as parts. Build both addition orders, then start each subtraction equation with the whole and take away one part.
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.
Two parts · one whole · four related facts.
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