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This Adding Multiples Of 10 drill has 40 problems for Grade 1. Escape Room theme. Answer key included.
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Max discovered mysterious number codes on the library door—he must solve each one fast to unlock his escape!
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 fluency. When children understand that 20 + 30 = 50, they're learning that tens can be combined just like ones, which makes larger addition problems feel manageable rather than overwhelming. This skill directly supports their ability to count money, tell time to the nearest 10 minutes, and solve two-digit addition problems without always needing manipulatives. At ages 6-7, students' brains are developing the ability to think about numbers in groups rather than just individual units—a critical shift toward abstract mathematical thinking. Mastering this concept also builds confidence; when kids see that 40 + 50 follows the same pattern as 4 + 5, they realize math has predictable rules they can use. This worksheet provides focused practice that strengthens number sense and prepares them for the multi-digit strategies they'll need in second grade.
What your student will practice
- Identify and recognize multiples of 10 in addition problems
- Apply tens place addition without regrouping
- Use place value understanding to solve mentally
- Explain why 3 tens plus 4 tens equals 7 tens
Common mistakes to watch for
The most common error is that first graders treat the tens digit as if it's separate from the ones digit, writing answers like 70 for 30 + 40 but then becoming confused about what that number actually means. Watch for students who count on by ones (30, 31, 32…) instead of by tens, which shows they haven't yet internalized the pattern. You'll also see mistakes where children add the tens correctly but then add extra ones they see, like solving 20 + 30 but then adding a random 5 because they misread or got distracted. If a student consistently gets the answer wrong, ask them to show you with fingers or draw tens and ones—this reveals whether they understand the concept or are just guessing.
Create a quick scavenger hunt around your home or classroom where you hide cards with multiples of 10 (like a fun escape-room challenge for the living room!). Have your child find two cards and add them together aloud before moving to the next pair. For example, if they find a card labeled '20' and another labeled '50,' they say '20 plus 50 equals 70' before hunting for the next cards. This makes the practice feel like a game rather than drill work, and the physical movement helps cement the pattern in their memory at this age.