Max Rescues the Sailboats: Fast Math Mission!

About this Grade 1 Mixed Add Subtract Drill

Mixed addition and subtraction problems are crucial for first graders because they require students to slow down, read carefully, and choose the right operation—a skill that mirrors real thinking, not just memorized procedures. At ages 6–7, children are developing the ability to hold information in their heads and make decisions based on that information, which is foundational for all future math. When your child sees a problem like "5 + 2 – 1," they must recognize that the plus sign means combine and the minus sign means take away, then apply those operations in order. This builds flexible thinking and prevents the common trap of assuming all problems follow the same pattern. Practicing mixed problems also strengthens number sense and helps children notice that 5 + 2 – 1 is not the same as 5 – 2 + 1, an insight that prepares them for more complex math. Like sailing a boat that requires adjusting to wind and current, math requires students to adjust their approach based on what they see.

What your student will practice

• Identify whether a problem asks to add or subtract by recognizing operation symbols
• Solve two-step mixed-operation problems left to right with accuracy
• Explain why 3 + 2 – 1 and 3 – 1 + 2 give different answers
• Build automaticity with mixed-operation fluency within 10

Common mistakes to watch for

The most common error is that first graders perform only the first operation and ignore the second one—for example, solving 6 + 2 – 1 by stopping after 6 + 2 = 8 and writing 8 as the final answer. Another frequent mistake is reversing the operation: a student might see a minus sign but add instead, or vice versa, especially when they're working quickly. You can spot these errors by looking at whether the student's work shows two separate steps or just one, and by asking them to point to each symbol and name it aloud before solving. Having students verbally narrate "plus means add more" and "minus means take away" before writing helps catch these operation reversals early.