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About this Grade 1 Mixed Add Subtract Drill

Mixed addition and subtraction problems are crucial for Grade 1 because they mirror how children encounter math in real life—not just adding, but also taking away and combining both ideas in a single problem. At ages 6-7, children's brains are developing the flexibility to switch between operations, which strengthens their number sense and prepares them for more complex word problems later. When your child solves 5 + 2 - 1, they're not just computing; they're tracking changes over time, much like when a father might have 5 cookies, gain 2 more, then share 1 away. This skill builds the mental stamina needed for multi-step thinking and helps children see that numbers aren't static—they shift and change based on what happens to them. Mastering mixed operations also reduces anxiety around "tricky" problems, building confidence that seems small now but pays enormous dividends in second and third grade math.

What your student will practice

• Solve addition and subtraction problems presented in a single equation
• Apply correct order of operations by working left to right
• Recognize when to add versus subtract within the same problem
• Build fluency with number combinations up to 10 using both operations

Common mistakes to watch for

The most common error is that first graders solve only the first operation and ignore the second one—for example, seeing 6 + 2 - 1 and stopping after writing 8, forgetting to subtract the 1. Another frequent mistake is confusing which operation to perform when the symbols change, especially when subtraction follows addition. You'll spot this when a child writes the correct first answer but then adds when they should subtract, or vice versa. To identify this pattern, cover the first operation and ask your child to tell you what the second symbol means before solving.