Working with hundreds? Here are a set of worksheets and games to help.
Relate single digit facts to three-digit addition
Add three digits without regrouping
Add three digits with regrouping
Round three-digit numbers to the nearest ten
Round three-digit numbers to the nearest hundred
Play a game rounding to the nearest ten
Play a game rounding to the nearest hundred
All of this is included in my Smart Board Western Three-digit Addition program.
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