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

Subtraction is taking away one number from another. Lilly has 4 balloons, but then one flys away. How many does she have left? You can use subtraction to find the answer. First there were 4 balloons.