Max Rescues the Weather Station: Operation Math Solver

About this Grade 3 Mixed All Operations Drill

By Grade 3, students encounter math problems that mix addition, subtraction, multiplication, and division all together—and this is exactly where many children's confidence either solidifies or shakes. At ages 8-9, your child's brain is developing the executive function needed to slow down, read carefully, and follow the correct sequence of operations. When kids see a problem like 12 ÷ 3 + 5, they need to know that division comes before addition, not the other way around. This skill directly supports their ability to solve real-world problems, whether figuring out cost splits at a store or calculating time needed for multiple tasks. Fluency with mixed operations builds the mathematical thinking that makes algebra possible in just a few years, and it teaches persistence—that problems worth solving sometimes require multiple steps and careful thinking.

What your student will practice

• Identify which operation to perform first in a problem with mixed operations
• Solve multi-step problems using addition, subtraction, multiplication, and division
• Apply left-to-right rules for operations of equal priority
• Check answers by working backward through the steps

Common mistakes to watch for

Many third graders default to solving left-to-right without thinking about operation priority, so they'll see 2 + 3 × 4 and compute (2 + 3) × 4 = 20 instead of the correct 2 + (3 × 4) = 14. Another frequent error happens when students rush and skip a step entirely, especially in three-step problems—they'll add two numbers, forget to multiply the result, and write an incomplete answer. You'll spot this pattern when a child's answer seems too small or too large compared to the numbers in the problem, or when they can't explain their thinking aloud. Watch for problems where they compute correctly but in the wrong order—this signals they need explicit reminders about which operations 'go first.'