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This Subtracting Multiples Of 10 drill has 40 problems for Grade 1. Fishing theme. Answer key included.
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Max's fishing net trapped 80 fish! He must release them by tens before they escape upstream.
Standard: CCSS.MATH.1.NBT.C.6
Subtracting multiples of 10 is a foundational skill that helps first graders see patterns in our number system and builds confidence with mental math. When children can quickly subtract 10, 20, or 30 from a number, they're developing number sense—the ability to understand how numbers relate to each other. This skill is essential because it bridges single-digit subtraction (which most children learn first) to larger numbers they'll encounter in second grade. At ages 6-7, children are developing working memory and can hold patterns in their minds, making this the perfect time to show them that subtracting 10 is just like subtracting 1, but in the tens place. Whether they're counting out 40 fish from a tank and removing 10, or figuring out how many cookies are left after giving away a group of 10, this skill appears everywhere in daily life. Mastering this concept also reduces anxiety around subtraction and makes children feel like capable mathematicians.
The most common error Grade 1 students make is subtracting the multiple of 10 incorrectly from both digits—for example, solving 34 − 10 as 33 instead of 24, or worse, 23. This happens because children haven't yet internalized that only the tens place changes; they may subtract from the ones digit too, or confuse the operation entirely. Watch for students who count backward by ones instead of by tens (saying 34, 33, 32... instead of 34, 24), which is inefficient and prone to counting errors. You'll also notice some children forgetting what the original ones digit was, writing a random number in the ones place of their answer.
Play a quick 'tens store' game at home or in class: give your child a pile of 30-50 small objects (blocks, crackers, dried beans) and announce a starting amount like 45. Ask them to 'sell' groups of 10 and tell you what's left—so from 45, they remove one group of 10 and you both count or figure out 35 remains. Do this with 2-3 starting amounts, keeping it playful and fast. This concrete, hands-on approach helps children physically see that the ones stay the same while only the tens shrink, making the abstract math click into place.