Pedal Power Subtraction Race

About this Grade 2 Subtraction Drill

Subtraction is a foundational skill that helps second graders make sense of the world around them—from figuring out how many snacks are left in a lunchbox to understanding change at a store. At ages 7-8, children are developing the ability to break apart numbers and see how quantities relate to each other, which strengthens their overall number sense and prepares them for multi-digit subtraction in later grades. This worksheet focuses on subtraction within 20, a range where students can still use concrete strategies like counting on their fingers or visualizing with objects, while also building fluency with facts they'll eventually recall automatically. Mastering subtraction at this level builds confidence and logical thinking skills that extend far beyond math class—whether a student is managing a bicycle repair kit or planning how many laps to ride around the block.

What your student will practice

• Subtract single-digit numbers from teen numbers using strategies like counting back or using ten-frames
• Recognize and solve subtraction facts within 20 with increasing automaticity
• Apply subtraction to real-world scenarios involving comparison and 'taking away'
• Use inverse relationship between addition and subtraction to check answers

Common mistakes to watch for

Second graders often forget to regroup or misccount when subtracting from numbers in the teens—for example, solving 15 − 7 by counting back but losing track and landing on 7 instead of 8. Another frequent error is reversing the numbers in their head, especially when the problem is written horizontally; they might calculate 12 − 5 as 5 − 12. You'll notice these patterns when a student's answers seem random or when they consistently get answers that are off by one. Ask them to explain their thinking aloud or use counters to verify—this reveals exactly where their strategy breaks down.