Use number facts to add or subtract a one-digit number and a two-digit number.
Lesson 10 / 15
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I can add and subtract a single digit number and a two-digit number.
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Known facts can be used to help solve equations with larger numbers.
Partitioning a two-digit number into tens and ones can help with seeing the pattern in the ones.
When adding to or subtracting from the ones without crossing the tens boundary, the tens digit does not change.
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