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This Adding Multiples Of 10 drill has 40 problems for Grade 1. Ocean Animals theme. Answer key included.
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Max discovered trapped dolphins need help! Add groups of ten fish to feed them all before the storm arrives.
Standard: CCSS.MATH.1.NBT.C.4
Preview
Page 1 — Drill
Page 2 — Answer Key
What's Included
About this Grade 1 Adding Multiples Of 10 Drill
Adding multiples of 10 is a cornerstone skill that helps first graders develop number sense and prepares them for two-digit addition. When children grasp that 20 + 30 = 50, they're learning to think in groups rather than counting by ones—a huge leap in mathematical thinking. This skill reduces cognitive load, letting students solve problems faster and with more confidence. By age 6 or 7, developing fluency with tens helps children recognize patterns in our base-ten number system, which is fundamental to all future math. Real-world counting—like adding toy groups of 10 or skip-counting by tens on a number line—makes this abstract concept concrete. Mastering multiples of 10 also builds the foundation for regrouping in addition and subtraction, skills they'll need in second grade and beyond.
What your student will practice
- Identify and add two multiples of 10 (e.g., 20 + 30) fluently
- Recognize that adding tens is like adding ones with a zero
- Solve one-step word problems involving multiples of 10
- Skip-count by tens and connect it to addition facts
Common mistakes to watch for
Many first graders add the digits incorrectly by ignoring the zeros—for example, solving 20 + 30 as 2 + 3 = 5 instead of 50. Others may count by ones from the beginning rather than recognizing they're working with groups of ten. You'll spot this if a child is slowly counting 20, 21, 22... instead of jumping by tens. Some students also confuse the place value, writing answers like '23' when they mean '50.' Watch for hesitation or finger-counting; these are signs they haven't internalized that tens can be added like single digits.
Create a real-world game at home or in class: give students coins (dimes), toy groups, or draw 10-item groups on paper and ask them to 'add the bags' of ten together. For instance, 'If you have two bags of 10 shells and three bags of 10 shells, how many shells altogether?' Start with small numbers (10 + 10, 10 + 20) and gradually increase. This hands-on grouping makes the abstract concept tangible for a 6-year-old's concrete thinking stage, and it naturally connects to ocean animals or any theme that involves countable objects.