. Grade 3, Illustrative icon

Making a ten

Illustrative MathematicsVaries

Students are expected to be fluent with addition and subtraction within 20 in second grade. This task builds on that knowledge by asking them to study more carefully the make-a-ten strategy that they should already know and use intuitively. In this strategy, knowledge of which sums make a ten, together with some of the properties of addition and subtraction, are used to evaluate sums which are larger than 10. The 10's in the table are shaded because they are essential to the technique.

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