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Lesson 229 of 500 · Extra Passages
⭐ 30 XPRegrouping Subtraction Part 4
📖Story Brief #229
Regrouping subtraction helps us when we need to subtract larger numbers.
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Regrouping subtraction helps us when we need to subtract larger numbers. Sometimes, when the top number is smaller than the bottom number in a column, we can't subtract directly. For example, in 42 - 27, we can't take 7 from 2, so we regroup. We borrow 1 ten from the 4 in the tens place, changing it to 3. Now, we have 12 in the ones place. So, 12 - 7 equals 5, and 3 - 2 equals 1. The answer is 15!
Check Your Understanding
Question 1
1 of 2What do we do when the top number is smaller than the bottom number in a column?
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