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This Adding Multiples Of 10 drill has 40 problems for Grade 1. Magic Show theme. Answer key included.
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Max's rabbit disappeared into ten magic boxes! He must add up the clues fast before the show starts.
Standard: CCSS.MATH.1.NBT.C.4
Adding multiples of 10 is a cornerstone skill that helps first graders see patterns in our number system and build confidence with larger numbers. When children master 20 + 10 or 30 + 20, they're not just memorizing facts—they're learning that tens work just like ones, which makes mental math faster and easier. This skill directly supports their ability to add two-digit numbers later and helps them count money, tell time, and understand place value more deeply. At ages 6-7, children's brains are becoming skilled pattern-recognizers, and multiples of 10 offer a perfect, predictable pattern to lock in. By practicing these problems, your student strengthens their understanding that 10 is a special, repeatable unit—a foundation that ripples through all future math learning.
The most common error is when students count on by ones instead of by tens—for example, solving 30 + 20 by counting 31, 32, 33 rather than 40, 50. You'll spot this if they take much longer than expected or write down individual numbers while solving. Another frequent mistake is forgetting the zero at the end, writing 5 instead of 50 when adding 20 + 30. Some children also confuse the tens digit with the ones digit when regrouping mentally. Watch for hesitation or finger-counting on simple problems like 10 + 10, which signals they haven't internalized the pattern yet.
Play a quick 'grocery store tens game' at home using items priced in multiples of 10 cents (or real coins if you have them). Ask your child, 'If this costs 30 cents and that costs 20 cents, how much together?' Let them use real objects or a pile of coins to count by tens aloud. This connects the worksheet skill to spending money, which feels like a real magic trick to a first grader because the answer appears so quickly once they see the pattern!