Subtraction: Learn to subtract 2-digit numbers from 3-digit numbers with regrouping.
This lesson teaches how to subtract 2-digit numbers from 3-digit numbers with regrouping. Practice free:
http://www.ilearn.com/subtract
This playlist teaches how to subtract numbers from two digits through 4 digits. The make a ten strategy covered in the Addition and Subtraction playlist is used in these lessons to teach regrouping. http://www.ilearn.com/subtract
The playlist is organized so that students progress from the simplest cases with the smallest number of digits and no regrouping to the more difficult cases with 4-digit numbers and regrouping in more than one place.
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If you prefer to read, rather than watch this video, here’s the transcript:
Title: Learn to subtract 2-digit numbers from 3-digit numbers with regrouping.
You can already subtract tens from a 3-digit number with hundreds, tens, and ones. In this lesson, you'll learn to subtract any two-digit number from some 3-digit numbers, like this.
142 minus 77.
We start subtracting in the ones place.
We can't subtract 7 from 2, so we have to take a ten to make ten ones.
We cross out the 4 to show that we took a ten.
We put 3 here to show there are 3 tens left and we put a 1 here to show we have 10 ones.
Now we have 12 minus 7, which is 5.
Now the tens place.
We have 3 minus 7. We can't subtract 7 from 3, so we have to take a hundred to make ten tens.
We cross out the 1 to show we took a hundred.
We don't need to put anything here, because there are no hundreds left.
We put a 1 here to show that we made ten tens.
Now we have 13 tens minus 7 tens, which is 6 tens.
Now the hundreds place.
We have no hundreds left, since we crossed out the one hundred and no number here.
That means we're done.
The answer is 65.
Another example. 137 minus 68.
We start subtracting in the ones place.
We can't subtract 8 from 7, so we have to take a ten to make ten ones.
We cross out the 3 and put 2 here to show there are 2 tens left.
We put a 1 here to show we have 10 ones.
Now we have 17 minus 8 which is 9.
Now the tens place.
We have 2 minus 6, so we have to take a hundred to make ten tens.
We cross out the 1, but we don't put anything here because there are no hundreds left.
We put a 1 here to show that we made ten tens.
Now we have 12 tens minus 6 tens, which is 6 tens.
Now the hundreds place.
We have no hundreds left, since we crossed out the one hundred and no number here.
That means we're done.
The answer is 69.
Another example. 113 minus 45.
We start subtracting in the ones place.
We can't subtract 5 from 3, so we have to take a ten to make ten ones.
We cross out the 1 and put 0 here to show there are no tens left.
We put a 1 here to show we have 10 ones.
Now we have 13 minus 5, which is 8.
Now the tens place.
We have 0 minus 4, so we have to take a hundred to make ten tens.
We cross out the 1, but we don't put anything here because we have no hundreds left.
We put a 1 here to show that we made ten tens.
Now we have 10 tens minus 4 tens, which is 6 tens.
Now the hundreds place.
We have no hundreds left, since we crossed out the one hundred and no number here.
That means we're done.
The answer is 68.
In the rest of this lesson, you'll solve problems like these.
http://www.ilearn.com/subtract
https://youtu.be/lG8VFhmV1pk
