Video: Subtracting Two Three-Digit Numbers by Counting Back

Count back in hundreds to find the difference. 429 − 300 = _

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Video Transcript

Count back in hundreds to find the difference. 429 take away 300 equals something.

In this problem, we’re given a subtraction. But we’re also provided with a clue as to how to find the answer. We’re told to count back in hundreds to find the difference. How many hundred should we count backwards? We’re taking away 300. So we need to count back in hundreds three times. Let’s show this on our number line.

Remember as we count in hundreds, it will be the hundredth digit that changes. The tens and the ones will stay the same. So we’ll start with 429 and let’s count in hundreds backwards three times: 329, 229, and 129. Three jumps of 100 is the same as subtracting 300.

And so 429 take away 300 equals 129.

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