Max Rescues Lost Forest Animals: Addition & Subtraction Sprint

About this Grade 2 Mixed Add Subtract Drill

Mixed addition and subtraction problems are crucial at this stage because they require students to read carefully, identify the operation needed, and execute it correctly—skills that directly support reading comprehension and flexible thinking. At age 7-8, children are moving beyond single-operation drills and learning that math problems don't always follow the same pattern, much like how a walk through nature involves both moving forward and stepping around obstacles. This skill builds number sense and prevents the common mistake of defaulting to one operation regardless of the symbol shown. When students can fluently switch between adding and subtracting in the same set of problems, they're developing the mental flexibility needed for multi-step word problems and stronger mathematical reasoning. Practicing mixed-add-subtract also strengthens working memory—students must hold the number in mind while deciding which operation to use, then execute it accurately.

What your student will practice

• Identify whether a problem requires addition or subtraction by reading the symbol
• Solve single-step addition and subtraction problems within 20 fluently
• Apply correct operation symbols to reach accurate answers without mixing up processes
• Build automaticity so switching between operations becomes second nature

Common mistakes to watch for

The most common error is that second graders rush and apply the wrong operation—they'll see a problem like 15 − 7 but add instead, getting 22. Another frequent mistake is forgetting to look at the symbol altogether and defaulting to addition because it's often introduced first. You can spot this by noticing if subtraction answers are consistently too large, or if a child admits they 'just added' without checking the sign. Some students also struggle with the concept that you don't always add, which shows up as hesitation or asking 'Which one do I do?' before attempting nearly every problem.