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This Mixed Add Subtract drill has 48 problems for Grade 3. Glaciers theme. Answer key included.
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Max spotted penguin chicks trapped on melting icebergs—he must solve equations fast to build ice bridges!
Standard: CCSS.MATH.3.NBT.A.2
By Grade 3, students need to fluently solve problems that mix addition and subtraction in a single expression—a skill that bridges their earlier work with single operations into the flexibility real math demands. At ages 8-9, children are developing the working memory needed to track multiple steps and the logic to choose the right operation for each part of a problem. Mixed-add-subtract problems build number sense and prepare students for multi-step word problems they'll encounter in upper elementary, while also reflecting how they encounter math in daily life: earning allowance, then spending some, then finding a balance. This worksheet targets the specific Common Core expectation that Grade 3 students can fluently add and subtract within 1000 using strategies based on place value, properties of operations, and the relationship between addition and subtraction. Mastering this skill also strengthens mental math flexibility and helps students recognize that the order of operations matters when problems combine both operations.
The most common error is when students try to 'combine' the operations instead of working left to right. For example, in 45 + 20 - 15, they might try to add 20 and 15 first, getting 45 + 35 = 80. Another frequent mistake is forgetting to regroup when the subtraction step requires it—like in 67 + 18 - 25, students subtract 25 from 67 without first adding the 18. You'll spot these errors by checking if their answer seems way too large or small, or by having them talk through their steps aloud.
Use a real-world scenario like tracking a glacier's movement (or any cause they care about—an animal's food storage, a sports score). Say: 'A glacier moves forward 30 feet, then slides back 12 feet, then advances 8 feet.' Have your child build the expression (30 - 12 + 8) and solve it step by step, writing each stage. Repeat with different numbers weekly. This embeds the left-to-right habit into a narrative they care about, making the abstract rule concrete and memorable.