Question Video: Subtracting Two-Digit Numbers with Regrouping Ones Mathematics • 2nd Grade

Find the value of the following: 34 − 15


Video Transcript

Find the value of the following: 34 subtract 15.

In this question, we’re subtracting a two-digit number from a two-digit number using the column subtraction method. We need to start by subtracting in the ones column. 34 has four ones, and 15 has five ones. So we need to calculate four subtract five. At the moment, we don’t have enough ones to subtract our five from. We’re going to need to regroup. We need to take one of our tens. So now we’ve got two 10s instead of three. And we can add 10 ones into the ones column. Instead of having four ones, we’ve got 14 ones. What is 14 take away five? It’s nine. So we can write this in the ones column.

Next, we need to subtract the tens. Two 10s take away one 10 leaves us with one 10. 34 subtract 15 equals 19. We found the answer using column subtraction.

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