Math Review: Add/Sub

We have completed our math curriculum (Math Expressions) and are now reviewing what we learned all year long. Today was 3-digit addition and subtraction. Students competed against partners to get four in a row correct. They used calculators to check their answers. They LOVED it!!

Methods of Subtraction

Our district adopted Math Expressions as our math curriculum (below are pictures from my teachers' manual). This is our first year with Math Expressions and I am in LOVE with it! I previously blogged about the addition strategies the students have learned. With subtraction, the students learned three strategies: Common U.S. Method, Ungroup First Method, and Expanded Method. Again, the students use Proof Pictures to show the ungrouping in subtraction and how to "take away" from the bigger number.