It's the 4th Quarter of 1st Grade. We are at the culmination of our study of addition and subtraction. In this unit we are adding and subtracting double-digit numbers. Here are the math vocabulary cards that we review.
This is the teacher binder. On the left it shows the lesson plan with essential questions, vocabulary, and picture instructions. On the right, I have printed the worksheet keys, 4 on a page.
We worked a lot with the hundreds chart, actually 120 chart. It really helps them visualize how our base 10 math system works.
Using base ten blocks is critical when teaching double-digit math, especially when regrouping. Students at this age need the concrete learning experiences to grasp these concepts. These have magnets on them for use on my teaching easel. Each student or pair is given a baggie with 10 cubes, 10 rods, and 1 flat to use when working problems.
In this picture, you can see that I lined up the blocks next to the numbers. I also arranged the cubes as if they were in a 10-frame. This helps students to subitize how many are in a group without counting.
In this problem, students are shown regrouping to make a 10. Moving the cubes to make a ten is a powerful way to help students understand that they need to move to the tens column.
If you don't have base 10 blocks or just want to use a different manipulative, popsicle sticks and hair tie rubber bands can also help students understand this concept.
Here are two examples of worksheets students can do to reinforce this concept.
This is a math mat included in the curriculum. After students have a handle on regrouping with manipulatives, they can move to the more abstract concept of carrying. This mat gives a visual understanding of how to move the tens to the tens column.
Here are some worksheets that students can do to reinforce regrouping. It has a gradual release of responsibility.
Finally students have to decide whether or not to carry the one.
In subtraction in first grade, students do not need to regroup or borrow.
To reinforce these concepts, I have included some centers.
Also included are editable story problems so that you can include your students in the problems.
Flashcards are included to continue practicing facts. They can be color-coded by skill if desired.
After using this curriculum, my students and the students in my school tested better on our end of the year assessments than ever before. :)
Click to check out Unit 4:
