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This Subtraction drill has 40 problems for Grade 2. Teachers theme. Answer key included.
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Max discovered 87 missing pencils scattered around the teacher's desk—he must organize them before class starts!
Standard: CCSS.MATH.2.NBT.B.5
Subtraction is one of the most practical math skills your second grader will develop this year. At ages 7-8, children are moving beyond counting on their fingers and building mental math strategies that help them solve real problems—like figuring out how many cookies are left after eating some, or how much allowance they'll have after spending money at a store. This worksheet builds automaticity with subtraction facts within 20, which is the foundation for two-digit subtraction and word problem solving in third grade. When students can quickly recall "10 - 3 = 7" without counting, their working memory is freed up to tackle more complex math. These drill exercises also build confidence and reduce math anxiety by making subtraction feel familiar and doable.
The most common error at this stage is "counting on" from the wrong number—for example, solving 12 - 5 by counting on from 5 instead of counting back from 12. You'll also see students forget to include the starting number when counting back, so they get 12 - 1 = 10 instead of 11. Another frequent mistake is losing track while counting, especially with larger gaps like 15 - 7. If your child is consistently off by one or two, they're likely miscounting rather than misunderstanding the concept.
Play a quick "Money Detective" game during snack time or errands: tell your child you have 14 cents and spent 6 cents, then ask them to figure out what's left without counting every single penny. Let them use real coins at first if needed, then gradually encourage mental math. This mirrors how teachers use real classroom scenarios—tracking how many students are present after some go to the nurse—and connects subtraction to decisions your child makes every day.