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This Adding Multiples Of 10 drill has 40 problems for Grade 1. Skateboarding theme. Answer key included.
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Max spotted ten shiny skateboard wheels rolling down the ramp! He must collect them all before they disappear forever.
Standard: CCSS.MATH.1.NBT.C.4
Adding multiples of 10 is a foundational skill that helps first graders see patterns in our number system and builds mental math fluency they'll use for years to come. When children understand that 20 + 30 is really just 2 tens plus 3 tens, they're developing number sense—the ability to think about quantities flexibly rather than counting on their fingers every time. This skill directly supports place value understanding, which is essential for two-digit addition and subtraction. At age 6 and 7, children's brains are ready to recognize and work with these clean patterns, making this the perfect time to solidify the concept. Mastering adding multiples of 10 also boosts confidence; students feel smart when they can solve 40 + 50 quickly without counting. These drills strengthen the neural pathways that make mental math automatic, freeing up brain space for more complex problem-solving as they move forward.
Many first graders add the tens correctly but then misplace the zero in their answer—for example, writing 3 + 5 = 8 when they see 30 + 50, forgetting the final zero entirely. Others revert to counting by ones instead of recognizing the pattern, treating 30 + 20 like a new problem each time rather than connecting it to 3 + 2. You'll spot this if a child is whispering or using fingers to count up from 30, or if they write answers like 7 instead of 70. A third common error is confusing the place value language; students might say '3 tens and 5 tens equals 8' but write 8 instead of 80, showing the thinking is there but the representation is incomplete.
Play a quick '10s Skip-Counting Game' at home using stairs or a hallway. Call out a multiple of 10 (like 20 or 40), have your child skip-count by 10s up to that number while taking steps, then add another multiple by continuing their steps. For example: 'Start at 30 and add 20 more steps—where do you land?' This combines movement with the pattern, making the concept stick for kinesthetic learners. Repeat this 5-10 times during a single session, celebrating when your child speeds up and doesn't need to count every step.