Alabama Learning Exchange
Alex: Mix It Up!
By now, young scholars have learned that fact families include both addition and subtraction facts. They have also learned that by reversing the order of the addends, they can form related addition facts with the same sum. The students...
Other
Nearpod: Addition & Subtraction Within 20
In this lesson on addition and subtraction within 20, 1st graders learn how to solve addition and subtraction story problems by finding clue words. Adding three addends is also taught in this lesson.
Illustrative Mathematics
Illustrative Mathematics: G Co Origami Equilateral Triangle
The purpose of this task is to explore reflections in the context of paper folding. Each fold is associated with a line of reflection and understanding each step in the construction requires careful analysis of angles and of the...
Alabama Learning Exchange
Alex: "Tan"
The Chinese character mark formerly known as "Tan" is the first of two lessons to introduce first grade students to geometry using tangrams. This lesson incorporates history, math, and language arts. In this lesson students will be able...