Max Solves the Case: Detective Math Challenge

About this Grade 2 Mixed Add Subtract Drill

At age 7-8, students are developing the mental flexibility to handle problems that ask them to both add and subtract in a single step. This is a crucial bridge between simple addition and the multi-step thinking they'll need for word problems and real-world math. When your child encounters a problem like "Start with 12, add 5, then subtract 3," they're practicing number sense, working memory, and sequencing—all essential skills for mathematical thinking. Mixed-add-subtract problems help students see that numbers aren't static; they change and flow based on operations. In daily life, this shows up constantly: a child with 8 trading cards who gets 3 more but loses 2 is solving a mixed operation without realizing it. Building comfort with these problems now prevents gaps later and builds confident problem-solvers.

What your student will practice

• Solve addition and subtraction problems in sequence without mixing up operations
• Accurately track and update running totals after each operation
• Apply mixed-add-subtract skills to real situations with multiple steps
• Demonstrate understanding by explaining the order of operations in their own words

Common mistakes to watch for

Second-graders commonly reverse operations—adding when they should subtract, or subtracting when they should add—especially if they work quickly without checking the sign. Another frequent error is losing track of the running total after the first operation; a student might add correctly, then forget what number they're starting with for the subtraction step. Watch for students who solve each operation correctly in isolation but can't string two operations together smoothly. You'll spot this when they get 8+5=13 correct, but then say 13-4=10 when the problem was 8+5-4, showing they applied the subtraction to 5 instead of 13.