Unit 4, Lesson 19# Substituting to Evaluate Addition and Subtraction Expressions

EngageNY 45 min(s)

Students develop expressions involving addition and subtraction from real-world problems. It should be clear that the day I was born was my sister's second birthday. Since my sister's age is always two years more than my age, we just add two to my age. Since my sister's age is always two years more than my age, we just add two to my age.