Understanding the inverse relationship between addition and subtraction is essential for developing fluency in young mathematicians. Zoe and RJ explain how three numbers can form fact families that make two addition and two subtraction...

Your learners will enjoy playing a game as a motivator to learning and remembering the adding and subtracting of fractions.

Your learners combine their knowledge of real and imaginary numbers and matrices in an activity containing thirty lessons, two assessments (mid-module and end module), and their corresponding rubrics. Centered on complex numbers and...

Third graders explore their addition and subtraction skills. In this number sense instructional activity, 3rd graders analyze different scoring possibilities for a basketball game. This instructional activity incorporates the...