The sample question demonstrates adding a 2-digit number and a 1-digit number in columns and explains why, when the numbers in the ones column add up to more than 9, they need to be grouped as tens and ones. Focus is on regrouping, rather than solving by mental math (counting up, etc).
Practice worksheets for this type of question can be found here:
Find all of our addition worksheets, from adding by counting objects to addition of multiple large numbers in columns.
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