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This Adding Multiples Of 10 drill has 40 problems for Grade 1. Back To School theme. Answer key included.
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Max must organize 60 scattered pencils and erasers before the first bell rings tomorrow morning!
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 six- and seven-year-olds build mental math flexibility and understand how our base-ten number system works. When children can quickly add 20 + 30 or 40 + 10, they're not just memorizing facts—they're developing number sense that makes larger addition problems feel manageable. This skill reduces cognitive load, freeing up working memory for more complex math thinking. Mastering multiples of 10 also gives children confidence as they head into second grade, where regrouping and two-digit addition become central. In real life, kids use this when counting skip-counting coins, tracking toys or crayons in groups of ten, or even organizing supplies for a new school year. These repeated exposures to tens build a mental framework that makes all future math learning faster and less frustrating.
What your student will practice
- Fluently add two multiples of 10 within 100
- Recognize and skip-count by tens to build automaticity
- Apply place-value understanding to tens-column addition
- Solve missing addend problems with multiples of 10
Common mistakes to watch for
First-graders often struggle when they add the tens digits but forget to include the zero—writing 6 for 20 + 40 instead of 60. Others confuse the mechanics and add across the tens and ones place separately as if they were independent numbers, yielding answers like 24 for 20 + 40. Watch for students who count on by ones instead of tens; this signals they haven't internalized the group-of-ten idea yet. A quick way to spot confusion is to ask them to show the answer with ten-sticks or blocks—struggling students may not see 60 as 'six groups of ten' but rather as just a number.
Create a simple tens-and-ones game using pennies or small snacks (graham crackers, cereal pieces) in groups of 10. Line up two groups—say 30 cents and 40 cents—and have your child count by tens aloud while touching each group: 'ten, twenty, thirty... forty, fifty, sixty, seventy.' Repeat this 2–3 times a week for just five minutes; the physical movement of counting and touching reinforces that tens combine predictably, and it keeps the learning playful rather than worksheet-focused.