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This Mixed Add Subtract drill has 40 problems for Grade 2. Ducks theme. Answer key included.
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Max spotted three ducklings trapped on the lily pad! He must solve every math problem to build the rescue bridge before sunset!
Standard: CCSS.MATH.2.OA.B.2
At age 7 and 8, second graders are building the mental flexibility to handle problems that switch between addition and subtraction in a single problem. This skill is crucial because it mirrors how children encounter math in real life—they might earn money, spend some, then earn more again. Mixed-add-subtract problems teach students to read carefully, track what operation comes next, and hold intermediate answers in their working memory. Mastering this skill strengthens number sense and prepares students for multi-step word problems in later grades. When children can fluidly move between adding and subtracting without getting confused, they gain confidence in their mathematical thinking and develop stronger problem-solving habits.
The most common error is that children solve the first operation correctly but then forget what number they're working with or misread the second operation sign. For example, in 8 + 5 − 3, a student might correctly get 13 from 8 + 5, then subtract 5 instead of 3 by accident, or add 3 instead of subtracting. Another frequent mistake is skipping the intermediate step entirely and trying to combine all three numbers at once without the order of operations. Watch for students who write the first answer down but then lose track of it mid-problem, or who circle the wrong number to work with next.
Create a simple storytelling game where you describe a short scenario with two actions: "You have 7 toy ducks, you get 4 more, then 3 swim away. How many are left?" Have your child act it out with objects or draw it, then write the matching math problem (7 + 4 − 3). Switch roles and let them make up the story for you to solve. This grounds mixed-add-subtract in familiar, playful contexts and helps them see that each symbol tells part of a complete story.