Regrouping with base ten blocks11/20/2023 ![]() ![]() Right away they will likely realize that the process they have been using doesn’t work with this problem-they only have 5 ones, so they can’t subtract 8. ![]() Pair up students and ask them to use their base-10 blocks to solve 45 – 18. ![]() You can get even more bang for your buck by introducing this next phase using problem-solving. Next up, you want to introduce a problem that will require regrouping. Stacking the numbers in a vertical format will come later. Notice that the problem is written horizontally. You want students to develop the understanding that we subtract ones from ones and tens from tens. Give students plenty of practice using base-10 blocks for problems that don’t require regrouping before moving on to the next step. Be sure to stress place value language during this phase of instruction-subtracting with regrouping is all about place value! So, for example, to solve 45 – 14, students would build 45 and remove 1 ten and 4 ones. Begin with problems that don’t require regrouping. Base-10 blocks are a great tool for modeling the process. Not surprisingly, we build understanding for the standard algorithm by starting with hands-on, concrete learning. There is no additional cost to you, and I only link to books and products that I personally use and recommend. This post contains affiliate links, which simply means that when you use my link and purchase a product, I receive a small commission. This post focuses on the progression for teaching subtraction with regrouping. This is a good thing! There are several developmental steps that students should move through before being introduced to the algorithm. More and more curriculum maps are delaying the teaching of the standard algorithm for addition and subtraction until later in the year. ![]()
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