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This Adding Multiples Of 10 drill has 40 problems for Grade 2. Board Games theme. Answer key included.
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Max rolled the giant dice and landed on spaces worth 10, 20, 30 points. He must collect all winning combinations before his opponents reach the finish line!
Standard: CCSS.MATH.2.NBT.B.5
Preview
Page 1 — Drill
Page 2 — Answer Key
What's Included
About this Grade 2 Adding Multiples Of 10 Drill
Adding multiples of 10 is a cornerstone skill that helps second graders recognize patterns in our number system and build mental math fluency. When students can quickly add 20 + 30 or 40 + 50, they're developing number sense that makes larger addition problems feel manageable—much like how knowing the rules of a board game helps you play faster and smarter. At age 7–8, children's brains are primed to spot patterns, and multiples of 10 provide that beautiful, predictable structure. This skill also strengthens place value understanding: students begin to see that 30 + 20 is really "3 tens + 2 tens = 5 tens," which deepens their grasp of how tens and ones work together. Mastering this foundation makes three-digit addition less intimidating and builds confidence in math class.
What your student will practice
- Add two multiples of 10 without regrouping accurately
- Recognize that adding tens is like counting by tens
- Apply multiples-of-10 addition to simple word problems
- Explain their thinking using tens language
Common mistakes to watch for
Many second graders add the tens digits correctly but then forget to write the zero in the ones place, writing 5 instead of 50 for 20 + 30. Others confuse the process and add 2 + 3 = 5 without recognizing they're really adding tens, leading to answers like 23 or 32. Watch for students who count on by ones (20, 21, 22...) rather than by tens, which is slower and prone to error. If you see these patterns, gently redirect by asking, "How many tens do you see?" before combining them.
Play a quick counting-by-tens game during everyday moments: while waiting in line or riding in the car, call out a multiple of 10 and ask your child to give you the next one. Start with 10, 20, 30 and gradually include mixed pairs like "What is 30 + 20?" Once they're comfortable, challenge them to tell you the answer without counting on their fingers. This keeps the skill sharp and shows them that adding tens is just like the tens-counting pattern they already know.