Rainforest Adventure: Subtract and Survive!

About this Grade 2 Subtraction Drill

Subtraction is one of the most practical math skills your second grader will develop this year. At ages 7-8, children are building the mental flexibility to break apart numbers and understand that subtraction is the reverse of addition—a crucial foundation for all future math. When your child can fluently subtract within 20, they're developing working memory and number sense that directly transfers to real-world situations: figuring out how many crayons are left in the box, calculating change at a store, or determining how many more pages they need to read. This drill grid strengthens automaticity—the ability to recall subtraction facts quickly without counting on fingers—which frees up mental energy for more complex problem-solving. Students who master subtraction facts by the end of Grade 2 enter third grade confident and ready to tackle multi-digit subtraction and word problems.

What your student will practice

• Fluently subtract within 20 using mental strategies and automaticity
• Recognize and apply the relationship between addition and subtraction facts
• Solve subtraction problems with and without regrouping in two-digit numbers
• Explain subtraction strategies using concrete models or drawings

Common mistakes to watch for

The most common error Grade 2 students make is subtracting in the wrong order—for example, writing 5 when asked to solve 12 − 7, by reversing it to 7 − 5. You'll also notice students who haven't yet internalized subtraction facts counting backward on their fingers very slowly, or forgetting to regroup when subtracting two-digit numbers (like solving 23 − 8 by incorrectly subtracting 8 from 2 first). A quick way to spot these patterns: watch whether your child pauses and counts for every single problem, or ask them to show their work with drawings or objects.