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Subtraction: Learn to subtract 1-digit numbers from 2-digit numbers Pt. 2. Teacherflix 3 Views • 2 years ago

This lesson teaches how to subtract 1-digit numbers from 2-digit numbers Pt. 2. 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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This video is one of over 800 lessons from iLearn on math topics ranging from kindergarten through high school math.

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If you prefer to read, rather than watch this video, here’s the transcript:

Title: Learn to subtract 1-digit numbers from 2-digit numbers Pt. 2.

You already know how to subtract when you have to take a ten.
In this lesson, you'll learn how to use that to subtract with numbers that have both tens and ones.
Here's an example. 43 minus 7.
We start with the ones place.
We can't subtract 7 from 3, so we have to take a ten from 40 to make ten ones.
We cross out the 4 in 40 and we enter a 3 here to show we have 3 tens left.
Now we put a 1 here to show that we have 13 ones.
So now we have 13 minus 7.
13 minus 7 is 6, so we put a 6 in the ones place of the answer.
There's nothing to subtract in the tens place, so we bring down the 3 for the 3 tens we have left.
That gives us 36.
So 43 minus 7 is 36.
Another example. 65 minus 8.
We start with the ones place.
We can't subtract 8 from 5, so we have to take a ten from 60 to make ten ones.
We cross out the 6 in 60 and we enter a 5 here to show that we have 5 tens left.
And we enter a 1 here to show we have 15 ones.
Now we subtract 8 from 15.
15 minus 8 is 7.
There's nothing to subtract in the tens place, so we bring down the 5 for the 5 tens we have left.
That gives us 57.
So 65 minus 8 is 57.
Last example. 37 minus 8.
We can't subtract 8 from 7, so we have to take a ten from 30 to make 10 ones.
We cross out the 3 in 30 and we enter a 2 here to show that we have 2 tens left.
And we enter a 1 here to show we have 17 ones.
Now we subtract 8 from 17.
17 minus 8 is 9.
There's nothing to subtract in the tens place, so we bring down the 2 for the 2 tens we have left.
That gives us 29.
So 37 minus 8 is 29.
In the rest of this lesson, you'll work problems like these. You can use these boxes if you want, but you don’t have to.

http://www.ilearn.com/subtract

https://youtu.be/bwrfoRv_hGk