2.05 Using the standard algorithm to add and subtract
Are you ready?
Are you able to use a standard algorithm to add numbers with no regrouping?
Find the value of $362+226$362+226.
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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.
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When we need to regroup to add or subtract, there are some different ways we can do this. Let's see how to solve an addition problem, then a subtraction problem.
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Question 1
Find the value of $685-493$685−493.
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What happens with larger numbers? We can use a standard algorithm to solve addition and subtraction, as we see in this video.
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Question 2
Find the value of $2242+2131$2242+2131.
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When we need to do some trading, or regrouping, the standard algorithm helps us line up place value digits. Let's see how to add or subtract, when we need to regroup.
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Question 3
Find the value of $6873-4937$6873−4937.
Each time we move one place to the left, the value of the digit is ten times bigger. This means we are able to regroup, or trade, to help us with addition and subtraction.