Count back & use the relationship between addition and subtraction to subtract within 20. Warm up with a Mystery Math Mistake to find the error in DC's addition. Use ...

Students put all of their addition and subtraction skills together to solve equations. In this lesson, students put all of their addition and subtraction skills together to solve equations. Julia ...

Susan Hobart asked this week’s “question-of-the-week": What strategies help math facts stick besides the old “drill the skill” and, if someone is not proficient at addition facts, can learning ...

Subtraction is a fundamental math skill that kids learn early in their academic journey. While it's a crucial building block for more complex arithmetic, the process of "taking away" can sometimes ...