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This Adding Multiples Of 10 drill has 40 problems for Grade 2. Baking Champions theme. Answer key included.
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Max discovered 50 giant cookie orders arriving today! He must add up ingredient amounts before the ovens close.
Standard: CCSS.MATH.2.NBT.B.5
Adding multiples of 10 is a cornerstone skill that builds your child's number sense and sets them up for multi-digit addition in Grade 3. When second graders master this concept, they're learning to recognize patterns in our base-10 number system—a critical insight that makes math feel less like memorization and more like logical thinking. At ages 7-8, children's brains are developing the ability to see groups and patterns, and multiples of 10 (10, 20, 30, 40...) are the most obvious place to start. This skill lets them add quickly without counting on their fingers, which boosts confidence and frees up mental energy for harder problems. Whether you're baking-champions or solving real-world problems like figuring out allowance or combining scores, adding tens appears constantly in daily life. Students who master this pattern also develop flexible thinking—they begin to see that 23 + 10 isn't a new problem, but rather a familiar pattern they can apply.
The most common mistake is that students count by ones instead of recognizing the tens pattern. You'll see this when a child adds 23 + 20 but counts: 24, 25, 26...instead of recognizing "just add the tens." Another frequent error is mixing up place value—they might write 23 + 20 = 43 by incorrectly combining the 2 and 2. Students also sometimes forget that the ones digit stays the same when adding tens (23 + 20 = 43, not 45). Watch for children who slow down significantly with multiples of 10—this signals they haven't internalized the pattern yet.
Play a real-world money game at home using dimes (which represent 10¢). Give your child a handful of dimes plus a few pennies, and ask: "If you have three dimes and two pennies, and I give you two more dimes, how much do you have?" This concrete, tactile experience shows why the ones place doesn't change when adding tens. Repeat with different combinations weekly, and gradually encourage your child to skip counting by tens (10, 20, 30) rather than counting each dime one at a time. This bridges the gap between concrete (real money) and abstract (numbers on paper).