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This Subtracting Multiples Of 10 drill has 40 problems for Grade 1. Gardening theme. Answer key included.
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Max's garden seeds are floating away! He must collect 80 seeds before the wind scatters them forever!
Standard: CCSS.MATH.1.NBT.C.6
Subtracting multiples of 10 is a cornerstone skill that builds your child's number sense and prepares them for larger subtraction problems. At age 6-7, children are developing the ability to recognize patterns in numbers, and multiples of 10 (10, 20, 30, 40, etc.) are the easiest place to start because they don't require regrouping or borrowing. When students master 50 - 20 or 70 - 30, they're learning that subtraction with tens follows the same logic as counting back by tens—a mental strategy they'll use for years. This skill also builds confidence: solving these problems correctly helps children see themselves as mathematicians. Plus, understanding tens helps with money (coins and bills), measurement, and even organizing a garden plot into neat rows of 10 plants. Fluency with multiples of 10 makes the leap to trickier subtraction feel manageable rather than overwhelming.
Many Grade 1 students subtract the tens digit incorrectly by forgetting that 10, 20, 30 represent groups of tens, not individual ones. For example, a child might solve 60 - 20 and write 40, but then solve 67 - 20 and incorrectly write 47 instead of 47—they subtract the 2 from the 6 correctly, but lose track. Another common error is reversing the operation: saying 40 - 10 = 50 because they count up instead of back. Watch for children who rewrite the problem vertically and align digits incorrectly, causing misplaced answers. Ask them to explain using tens language: 'You have 6 tens. You take away 2 tens. How many tens are left?'
Play a simple game at home using coins or a paper chart labeled 10 through 100 by tens. Call out a number (like 80) and ask your child to subtract 20 mentally or by pointing, then tell you what's left. Let them move a toy or marker back along the tens to make it visual. This mirrors how children naturally learn—through movement and immediate feedback—and feels like play rather than work. Rotate who gives the problem, and celebrate quick answers with genuine praise to build that 'I'm good at this' feeling.