3.05 Subtraction using algorithm
Lesson
Are you ready?
How did you find adding numbers, using the standard algorithm?
Vocabulary:
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Another word that we can use to describe the ones place is 'units'.
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You might notice that sometimes the standard algorithm is called the 'vertical algorithm'. Let's think about why. When we use the standard algorithm, we line our numbers up in 'vertical' place value columns.
Learn
Let's try some subtraction problems, using the standard algorithm. We use place value models to help us, so you might like to have some handy as you watch the video.
Apply
Remember!
When we solve problems using an algorithm, we have to line up our digits by place value. With subtraction, we always put the total at the top, and the number we are subtracting, below.