Free printable math drill — download and print instantly
This Mixed Add Subtract drill has 48 problems for Grade 3. Bug Hunters theme. Answer key included.
⬇ Download Free Math DrillGet new free worksheets every week.
All worksheets checked by our AI verification system. No wrong answers — guaranteed.
Max discovered 47 escaped beetles hiding in the garden! He must solve every equation to recapture them before nightfall.
Standard: CCSS.MATH.3.NBT.A.2
By Grade 3, students are ready to solve problems that mix addition and subtraction in a single expression—a critical step toward algebraic thinking and real-world problem-solving. When your child tracks allowance earnings and spending, calculates scores in games, or helps you manage a shopping list, they're naturally using mixed operations. This skill strengthens number sense because students must hold multiple steps in mind, decide which operation comes first, and manage their work systematically. Mastering mixed-add-subtract builds confidence with two-digit and three-digit numbers while developing the careful, organized thinking that mathematicians use every day. Without fluency here, students struggle later with word problems and multi-step reasoning in upper grades.
The most common error Grade 3 students make is ignoring the left-to-right rule and randomly choosing which operation to do first. For example, when solving 45 – 12 + 8, they might add 12 + 8 first, then subtract from 45, getting the wrong answer. Watch for answers that are significantly too large or too small, or when a child reverses operations (subtracting when they should add). Another frequent pattern: students forget to process the second number correctly, especially when it requires regrouping or borrowing.
Play a real score-tracking game together using a sport your child enjoys—keep a running tally as points are earned and lost over several rounds. Start with small numbers (like scoring in a simplified card game: start at 10, add 5 for a win, subtract 3 for a loss). Your child writes or says each operation and calculates the new total aloud, which reinforces both the left-to-right habit and the real-world reason these problems matter. This makes mixed operations feel like a tool for something fun, not just worksheet practice.