Find the missing addend when adding two-digit numbers
Lesson 13 / 15
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Lesson outcome
I can find the missing addends when adding two-digit numbers.
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Two-digit numbers can be partitioned to help find a missing digit or a missing addend.
One equation can be used to help solve another equation.
The patterns in equations can be used to help find a missing addend.
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This content is by Cashar and published under an open licence.