We recently finished up our unit on subtraction and I wanted to share with you a few activities and things that we worked on. I teach second grade and our goal is for students to be able to subtract 2 and 3-digit numbers with and without regrouping. We also use CGI (Cognitively Guided Instruction) at our school so there is more than one strategy that can lead you to the correct answer.
Below is the anchor chart that we created as a class. We worked on a different strategy each day. Day 1 was place value. I started off with a story problem and then had a student share who had used that strategy. Then, we added it to the chart and practiced whole group and small group. This continued until each strategy was added. After practicing and trying each strategy, students were able to pick the strategy that works best for them.
I use a lot of small group instruction now during math and we have math rotations 3-4 times a week. Here one of my groups is working on a 3-digit subtraction problem. As you can see, everyone is solving it in a way that works for them!
Also during rotations we have game time. I introduced Subtraction Memory first. Subtraction Memory is a game that focuses on 2-digit subtraction. There are two versions. One version doesn’t have regrouping and the second version has problems with and without regrouping for differentiation. It can be found in my TPT store…here…
As the week continued I changed the game up. Later in the week students worked on Subtraction True/False Sort. This activity is also differentiated to help all learners. Version 1 has 10 problems to sort and the problems are a little simpler. Version 2 has 20 problems to sort and they have more difficulty. This is a great activity for students to practice the different strategies and work together to see if the problem is true or false. This can also be found in my TPT store…here…
Check back later this week for another round of math ideas – this time for Properties of Addition and it will include a FREEBIE!