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This Adding Multiples Of 10 drill has 40 problems for Grade 1. Olympic Games theme. Answer key included.
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Max races across the Olympic stadium collecting gold medals worth 10 points each—he must score 100 before the torch ceremony!
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 recognize patterns in our number system and build mental math confidence. When children understand that 20 + 30 = 50, they're not just memorizing facts—they're discovering that numbers follow predictable rules. This skill directly supports place value understanding, which is essential for all future arithmetic. At ages 6-7, brains are developing the ability to see patterns and relationships, making this the perfect time to anchor this concept. Mastery of adding multiples of 10 gives children a foundation for two-digit addition and helps them feel capable when solving problems. Whether counting points at the olympics or combining groups of items at home, this skill appears everywhere in daily life.
What your student will practice
- Quickly add two multiples of 10 without counting on fingers
- Recognize that 3 tens plus 2 tens equals 5 tens
- Apply adding multiples of 10 to simple word problems
- Explain why 40 + 20 and 4 + 2 follow the same pattern
Common mistakes to watch for
The most common error occurs when children add the zeros separately rather than ignoring them. For example, a child might solve 30 + 40 by adding 3 + 4 = 7, then adding 0 + 0 = 0, resulting in 70 instead of correctly getting 70. Watch for children who revert to counting on their fingers by ones (30, 31, 32...) instead of counting tens. You'll spot this if they're slow and hesitant on problems they should solve instantly. Another pattern is writing answers like '70' but saying 'seven' instead of 'seventy,' suggesting weak understanding of place value.
Create a simple game using household items arranged in groups of 10—blocks, crackers, or pasta shapes work perfectly. Ask your child to combine two groups and say the answer aloud before counting. For instance, 'Here are 2 groups of 10 blocks. Here are 3 more groups of 10 blocks. How many tens do we have altogether?' This concrete, hands-on approach helps anchor the concept faster than worksheets alone, and it takes just 5 minutes during snack time or playtime.