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This Adding Multiples Of 10 drill has 40 problems for Grade 1. Helicopters theme. Answer key included.
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Max pilots his rescue helicopter and must collect fuel bundles by tens before the storm hits the airport!
Standard: CCSS.MATH.1.NBT.C.4
Adding multiples of 10 is a foundational skill that builds your child's number sense and prepares them for place value understanding. When first graders can fluently add 20 + 30 or 40 + 10, they're learning that tens can be combined just like single objects—a crucial step before tackling two-digit addition with regrouping. This skill also appears constantly in real life: counting coins in dimes, organizing objects into groups of ten, or tracking scores in games. At ages 6-7, children's brains are developing the ability to think about numbers in chunks rather than counting by ones every time, which makes repeated practice with multiples of 10 incredibly valuable. Mastering this concept builds confidence and mental math speed that will serve them throughout elementary math.
The most common error is when students revert to counting by ones instead of recognizing that 20 + 30 means 2 tens plus 3 tens, which equals 5 tens (50). Watch for students who write out 20, 21, 22, 23... instead of jumping by tens. Another frequent mistake is forgetting the zero at the end—a child might say 20 + 30 = 5 instead of 50. You'll spot this if they're losing the tens place value and treating the problem like 2 + 3. Encourage them to think "2 tens and 3 tens make 5 tens," then write the zero.
Play a quick game where you gather 10 small objects (buttons, blocks, cereal pieces) and make two piles—one with 2 piles of ten, one with 3 piles of ten. Ask your child to count the total piles of ten together, then write the number. Switch roles: you make the piles, they count and say the sum aloud. This tactile, visual approach helps children see that tens combine the same way individual objects do, making the abstraction of 20 + 30 feel real and concrete.