Add 2-digit numbers when crossing the tens boundary
Lesson 4 / 15
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I can add two-digit numbers when the sum crosses the tens boundary
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When adding two-digit numbers that cross the tens boundary, both addends can be partitioned, then recombined.
When adding two-digit numbers that cross the tens boundary, one addend can be partitioned. This is more efficient.
A number line can be used to find a missing addend when the tens boundary is crossed.
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