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This Adding Multiples Of 10 drill has 40 problems for Grade 1. Oak Trees theme. Answer key included.
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Max discovered baby squirrels hiding acorns throughout the giant oak trees before winter arrives tomorrow!
Standard: CCSS.MATH.1.NBT.C.4
Adding multiples of 10 is a cornerstone skill that helps first graders recognize patterns in our base-10 number system and builds mental math flexibility. When children master 20 + 30 or 40 + 10, they're developing number sense that will make all future addition easier—without needing to count on fingers every time. This skill also connects directly to how we count money, measure objects, and skip-count, which are everyday tasks even a six-year-old encounters. By working with tens, students begin to see that numbers have structure and order, not just random values. This mental organization helps their brains process larger numbers more efficiently and prepares them for two-digit addition later on. The confidence they build from solving these problems quickly also motivates them to tackle harder math challenges.
Many Grade 1 students add the tens digit and forget to write the zero in the ones place—answering 20 + 30 as 5 instead of 50. Others revert to counting by ones (1, 2, 3...) instead of using tens, especially when tired or under pressure. Watch for students writing numbers backward or mixing up the digit order entirely. You can spot this by asking them to show the answer with ten-frames or base-ten blocks; if they can build it correctly but write it wrong, it's a recording issue, not a math misunderstanding.
Use a real scavenger hunt at home or in the classroom where you label objects in groups of 10—ten blocks in a bag, ten acorns, ten crackers—and ask your child to combine two groups aloud before writing the answer. For example, 'We have 20 acorns here and 30 acorns there. How many acorns altogether?' This concrete, hands-on pairing of spoken math with written numbers anchors the concept and makes it stick far better than worksheets alone.