2.07 Addition with regrouping
Lesson
Are you ready?
Do you remember how to solve addition problems by writing them down the page, using an algorithm?
Find the value of $52+44$52+44.
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
Sometimes when we add numbers together we need to regroup, or use trading. Let's see when we need to do this, and how we do it.
Apply
Find the value of $18+19$18+19.
Remember!
The largest value a digit can be is $9$9. If we add and end up with more than $9$9, we need to trade, or regroup, to the next digit to the left.