Math

Chapter 2:  Subtraction within 20

Essential Question:  How can you use strategies to subtract within 20?

Lessons:

2-1 Subtraction Concepts

2-2  Take apart

2-3  Subtract to Compare

2-4  Count on to Subtract

2-5  Related Subtraction Facts

2-6 Relate Addition and Subtraction

2-7 Fact Families

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2-8 Think Addition to Subtract

2-9  Use Addition to Subtract

2-10  Solve for Unknowns

2-11 Make 10 to Subtract

2-12  Problem Solving

Math vocabulary words:

subtract

equation

minus sign

equals sign

difference

related facts

count back 

work backwards