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This Mixed Add Subtract drill has 40 problems for Grade 1. Zookeeper theme. Answer key included.
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Max discovered 8 animals escaped their habitats! He must solve math problems to safely return each animal before feeding time ends.
Standard: CCSS.MATH.1.OA.C.6
Preview
Page 1 — Drill
Page 2 — Answer Key
What's Included
About this Grade 1 Mixed Add Subtract Drill
At age six and seven, children are building the mental flexibility to switch between adding and subtracting within the same problem—a skill that mirrors real-world thinking. When a child counts out toys, loses some, finds more, and needs to figure out the total, they're doing exactly what mixed-add-subtract requires. This practice trains young brains to read symbols carefully (the plus and minus signs), track what's happening step by step, and adjust their thinking mid-problem rather than defaulting to one operation. Mastering this skill prevents the common trap of younger children who see a mixed problem and either add everything or subtract everything regardless of the signs. It also builds number sense and confidence with small quantities (typically within 10-20), preparing children for more complex multi-step thinking in Grade 2. These drills help cement automaticity so children can solve problems fluently without counting on fingers.
What your student will practice
- Identify whether to add or subtract by reading operation symbols correctly
- Solve mixed-operation problems in sequence from left to right
- Build fluency with addition and subtraction facts within 20
- Demonstrate flexibility switching between operations in one problem
Common mistakes to watch for
The most common error is sign-switching: a child solves 8 + 3 - 2 correctly as 9, then writes 11 instead because they accidentally added the last number. Another frequent mistake is reading left-to-right incorrectly—starting with subtraction when addition appears first. Watch for students who always perform the same operation (adding the three numbers, for example) regardless of the symbols shown. These errors reveal that the child isn't yet pausing to read each sign, a critical habit at this level.
Play a real-world version at home: give your child a small pile of objects (crackers, blocks, coins) and tell a quick story like a zookeeper counting animals. Say, 'We have 7 animals, 2 more arrive, then 1 runs away—how many now?' Have your child move the objects to match each step, saying the operation aloud each time. This physical, narrative approach helps cement the habit of reading and responding to each symbol separately rather than rushing through.