Max Rescues Dinosaur Eggs: Addition and Subtraction Sprint

About this Grade 2 Mixed Add Subtract Drill

Mixed addition and subtraction problems are crucial at this stage because they require second graders to slow down and read carefully—a skill that transfers across all math and literacy learning. At ages 7-8, students' brains are developing stronger working memory, allowing them to hold both an operation and a number in mind simultaneously. When children encounter problems like 8 + 5 - 3, they must decide which operation to do first, check their arithmetic, and verify their answer makes sense. This develops mathematical reasoning and helps prevent the common mistake of automatically adding every number they see. Real-world situations constantly mix operations: saving allowance (addition) then buying a snack (subtraction), or finding extra dinosaur stickers and trading some away. Mastering mixed operations builds confidence and prepares students for multi-step word problems in later grades.

What your student will practice

• Correctly identify whether each operation is addition or subtraction
• Solve problems with two operations in left-to-right order
• Check answers using inverse operations or number sense
• Apply mixed operations to simple word problem contexts

Common mistakes to watch for

The most common error is "number-grabbing"—students add or subtract all numbers in sight regardless of the operation symbol. For example, with 12 - 4 + 3, they might compute 12 + 4 + 3 = 19 instead of the correct 11. Another frequent mistake is skipping the second operation entirely and only solving the first part. You'll spot this when a child writes 12 - 4 = 8 and stops, ignoring the + 3. A third pattern is reversing the operation: computing 5 + 2 - 1 as 5 - 2 + 1 because they misread or forgot the sign partway through. Have students circle or point to each operation symbol before they start solving.