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This Mixed Add Subtract drill has 40 problems for Grade 1. Dragonflies theme. Answer key included.
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Max spotted dragonflies trapped in the lily pond! He must solve each math problem to free them before sunset.
Standard: CCSS.MATH.1.OA.C.6
At age 6 and 7, your child's brain is ready to handle problems that switch between adding and subtracting—a crucial step toward flexible mathematical thinking. Mixed-add-subtract problems train students to slow down, read carefully, and choose the right operation instead of defaulting to whichever they learned last. This skill prevents the common trap where children automatically add every number they see or subtract reflexively. By practicing these mixed problems, first graders develop number sense and the ability to think strategically about what a problem is actually asking. These habits form the foundation for multi-step word problems in later grades. When children can confidently solve "5 + 2 = ?" followed immediately by "7 - 3 = ?", they prove they understand operations as separate tools, not just routines.
The most common error is operation carryover: a child adds in one problem, then automatically adds in the very next problem even though it requires subtraction. You'll spot this when they write "6 + 3 = 9" correctly, then immediately solve "8 - 2" as "8 + 2 = 10." Another frequent mistake is ignoring the symbol altogether and guessing based on pattern recognition or muscle memory. Watch for students who hesitate or freeze when they see a minus sign after successfully completing addition problems, which signals they haven't internalized that subtraction is a distinct operation. Having them point to and say the symbol aloud before solving helps interrupt this pattern.
Try a hands-on game at home using small objects like buttons, blocks, or snacks. Say a mixed-add-subtract problem aloud ("Start with 4, add 2, now subtract 1"), and have your child build it with objects step by step, saying the operation name before acting on each instruction. This physical, verbal rehearsal anchors the switch between operations better than pencil-and-paper drills alone. For a child who loves dragonflies or insects, you could say "You have 6 dragonflies, 3 more arrive, now 2 fly away—how many dragonflies stay?" The story context combined with movement makes the operation change stick.