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This Mixed Add Subtract drill has 40 problems for Grade 2. Robots theme. Answer key included.
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Max discovered the Robot City power grid failing! He must solve equations fast to restore each robot's energy before they freeze.
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Page 1 — Drill
Page 2 — Answer Key
What's Included
About this Grade 2 Mixed Add Subtract Drill
At age 7-8, your child is developing the mental flexibility to switch between addition and subtraction within the same problem—a skill that's foundational for all future math. Mixed-add-subtract drills build what mathematicians call "operation sense," helping students recognize when to add and when to subtract based on context clues like the plus and minus signs. This isn't just about getting the right answer; it's about training the brain to read carefully, plan a strategy, and execute it step-by-step. Children who practice these mixed problems become more confident problem-solvers because they learn that math isn't one-size-fits-all—sometimes you combine, sometimes you take away. You'll notice this skill showing up in real life when your child figures out "I have 12 stickers and got 5 more, then gave away 3," without needing manipulatives every time.
What your student will practice
- Identify operation signs and solve single-step addition and subtraction within 20
- Complete mixed drill grids with alternating addition and subtraction problems
- Demonstrate fluency and speed in recalling facts without counting on fingers
- Self-check answers and recognize when a result doesn't make sense
Common mistakes to watch for
Second graders often rush and ignore the operation sign, defaulting to whichever operation they just finished—if they solved three additions in a row, they'll add the next problem even if it shows a minus sign. Another common pattern is misplacing the smaller number; students might see "5 - 12" and automatically compute "12 - 5 = 7" because it feels safer. Watch for answers that are consistently too high (student adding when they should subtract) or inconsistency within the same grid (some problems correct, others wrong, showing careless errors rather than skill gaps).
Play a real-world version at the dinner table using small quantities your child encounters daily: "You have 8 crackers, eat 3, then I give you 2 more—how many now?" Start with just the numbers (skip writing), let your child solve aloud, then gradually write the expression (8 - 3 + 2) so they see the symbols match the story. This bridges the gap between concrete thinking and abstract symbols, making the worksheet feel like a familiar game rather than a test.