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This Adding Multiples Of 10 drill has 40 problems for Grade 1. Labor Day theme. Answer key included.
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Max must collect 80 lost prize tickets before the Labor Day carnival closes at sunset!
Standard: CCSS.MATH.1.NBT.C.4
Adding multiples of 10 is a cornerstone skill that helps first graders understand place value and build mental math fluency. When children learn that 20 + 30 is the same as 2 tens + 3 tens, they're developing a concrete grasp of how our number system works—a foundation for all future math. This skill reduces their dependence on counting by ones and trains their brains to recognize patterns in numbers. By practicing with multiples of 10, six- and seven-year-olds gain confidence with larger numbers they encounter daily, from counting toys to understanding simple word problems. Whether helping a parent organize items during a Labor Day cleanup or solving problems in class, students who master this skill can solve problems faster and feel proud of their growing abilities.
Many first graders treat multiples of 10 like regular single-digit addition, incorrectly solving 30 + 20 as 3 + 2 = 5 instead of 5 tens = 50. You'll spot this when a child writes 30 + 20 = 5 or counts on their fingers by ones rather than by tens. Another common error is mixing up the place value—a child might say 30 + 20 = 35, confusing the operation. To check for understanding, ask students to explain what the '3' and '2' actually represent (tens, not single objects), and watch whether they count by tens aloud.
Create a real-world tens activity by gathering 10 small objects (buttons, crackers, blocks) and asking your child to make groups of 10. Say, 'Let's say this group of 10 buttons is 10. If I make another group of 10, how many do I have now?' Physically move the tens groups together while counting by tens aloud (10, 20, 30). This hands-on approach helps six- and seven-year-olds see that adding multiples of 10 is really just combining groups, not a mysterious new skill. Repeat with different numbers so the pattern becomes automatic.