Section A- Understanding Addition

2-1 Stories about Joining

2-2 Using Counters to Add

2-3 Using Numbers to Add

2-4 Zero in Addition

2-5 Vertical Addition

2-6 Write a Number Sentence

Section B- Understanding Subtraction

2-7 Stories about Separating

2-8 Using Counters to Subtract

2-9 Using Numbers to Subtract

2-10 Zero in Subtraction

2-11 Vertical Subtraction

2-12 Choose an Operation

Section C- Using Subtraction to Compare

2-13 Using Cubes to Compare

2-14 Using Subtraction to Compare