Mixed Addition & Subtraction — Within 20
Free & unlimitedNo loginAnswer key includedCCSS 2.OA.2
Mixed pages are where fluency gets honest: when + and − alternate unpredictably, students must read the sign, not run on autopilot. Research on interleaved practice consistently shows better retention than blocked drills — harder in the moment, stickier in the long run.
These sheets interleave addition and subtraction within 20 in a balanced rotation, with an answer key on its own page.
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Name ____________Date ______Score ____/50
111 + 9 = ____
23 + 14 = ____
30 + 12 = ____
416 − 11 = ____
59 − 7 = ____
610 + 1 = ____
720 − 7 = ____
813 − 2 = ____
913 − 11 = ____
1019 − 12 = ____
116 + 9 = ____
1215 − 9 = ____
1318 − 13 = ____
146 + 12 = ____
1514 − 3 = ____
Preview: first 15 of 50 problems (Mixed practice within 20, CCSS 2.OA.2). Open the generator for the full sheet + answer key — or press “New set” for a completely fresh one.
💡 Introduce mixed pages only after each operation is ~90% accurate alone. Before that, mixing practices sign-reading errors, not fluency.
Frequently asked questions
- Why mix addition and subtraction on one page?
- Interleaving forces retrieval: the student must decide what to do, not just do it repeatedly. That decision is exactly what tests and real math demand.
- When are students ready for mixed practice?
- When single-operation sheets are consistently above ~90% accuracy. Mixed pages then consolidate; used too early, they frustrate.