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This Adding Multiples Of 10 drill has 40 problems for Grade 1. Wind Turbines theme. Answer key included.
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Max discovers the wind turbines stopped spinning! He must collect energy crystals by tens to restart them before dark.
Standard: CCSS.MATH.1.NBT.C.4
Adding multiples of 10 is a gateway skill that helps first graders see patterns in our number system and builds confidence with larger numbers. When children understand that 20 + 10 = 30 or 40 + 20 = 60, they're recognizing how tens work together—a foundation for all future addition and subtraction. This skill also develops number sense, helping six- and seven-year-olds move away from counting on their fingers and toward mental math strategies. In everyday life, kids encounter multiples of 10 constantly: counting dimes, stacking blocks in tens, or thinking about scores in simple games. By drilling these combinations now, you're building automaticity—the ability to retrieve answers quickly and accurately without counting—which frees up mental energy for harder math later. This worksheet gives students repeated, focused practice with the specific number pairs they'll use throughout elementary school.
Many first graders add the tens digit and the ones digit separately, treating 20 + 30 as if they're adding random numbers rather than recognizing them as 2 tens + 3 tens. Watch for students who write 20 + 30 = 23 or 40 + 50 = 94—they're often just adding the first digits they see without thinking about place value. Another common error is reverting to finger counting or slow counting-on strategies, which suggests the student hasn't internalized that 20 + 10 is simply 2 tens plus 1 ten equaling 3 tens, or 30. If your student is guessing or hesitating on every problem, they may not yet see the pattern that the answer is always a multiple of 10.
Play 'Tens Hop' with your child: lay out number cards (10, 20, 30, 40, 50) on the floor like stepping stones, and have them physically jump to add two numbers—for example, 'Jump to 20, then jump 30 more times' (or move 30 steps forward). Say the problem aloud together: '20 plus 30 equals 50.' Repeat with different pairs, letting them feel the rhythm and see the pattern. This kinesthetic approach helps six-year-olds anchor the concept in their bodies, not just their worksheets, making the abstract idea of 'tens' concrete and memorable.