Add two-digit numbers without crossing the tens boundary
Lesson 5 / 15
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Lesson outcome
I can add two-digit numbers without crossing the tens boundary.
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Two-digit numbers can be added by using Base 10 equipment to combine the tens and the ones.
Partitioning two-digit numbers can help when adding them.
Either the tens or the ones can be added first, the sum will remain the same.
Considering the number of tens when adding two-digit numbers can help estimate the sum.
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