Max Rescues the Secret Agent: Addition & Subtraction Mission

About this Grade 1 Mixed Add Subtract Drill

In first grade, students are beginning to see that addition and subtraction are connected—and that math problems don't always follow the same pattern. Mixed-add-subtract drills help children build flexible thinking by switching between operations within a single set of problems. At ages 6-7, children's brains are developing the ability to hold multiple rules in mind, and practicing this skill strengthens their working memory and number sense. When a child encounters 5 + 2 followed by 7 - 3, they're learning to pause, read carefully, and choose the right operation—skills that prevent careless mistakes and build confidence. This flexibility is foundational for multi-step word problems and real-world math, like figuring out how many toys you have after combining and then losing some. Mastering mixed operations now sets the stage for stronger problem-solving throughout elementary school.

What your student will practice

• Identify whether a problem requires addition or subtraction by reading operation symbols
• Solve addition and subtraction problems accurately within 10 and 20
• Maintain focus and accuracy when operations change within a single worksheet
• Apply number bonds and mental math strategies to solve mixed problems fluently

Common mistakes to watch for

The most common error Grade 1 students make is reverting to the same operation they just completed—a child solves 6 + 3, then automatically adds when they see 8 - 2, producing 10 instead of 6. You'll spot this pattern when the student answers are consistently wrong on alternating rows or when switching between add and subtract sections. Another frequent mistake is confusing the symbols themselves; some children still mix up the + and − signs, especially under timed pressure. Watch for erasing and re-doing answers, which signals the child recognized an error but didn't catch it on their own.