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 Addition

Our district adopted Math Expressions as our math curriculum. This is our first year with Math Expressions and I am in LOVE with it! It is very face-paced, but it builds upon itself very well. The students are catching on quickly and I can see so much growth in them from the beginning of the school year.

I took some pictures of my teacher manual of the three methods of addition we taught the students. They are: New Groups Above (this is most common in U.S.), New Groups Below, and Show All Totals.

 

My students have gravitated with New Groups Above mostly. This is the one I am most comfortable with as well. New Groups Below is almost the exact same as New Groups Above, except your put your "new group number" on the equation line instead of above the place value (see picture, it will make more sense). Show All Totals is adding in expanded form. This is helpful for students to "see" the new groups happening. We also create Proof Pictures to prove the addition happened with place value drawings.