Topic 1- Understanding Addition and Subtraction

Lesson 1-1 Addition: Writing Addition Number Sentences

Key Words: part, whole, add, sum, addition sentence, plus (+), equals (=)

Lesson 1-2 Addition: Stories About Joining

Key Words: join

Lesson 1-3 Subtraction: Writing Subtraction Number Sentences

Key Words: subtract, difference, subtraction sentence, minus (-)

Lesson 1-4 Subtraction: Stories About Separating

Key Words: separate

Lesson 1-5 Subtraction: Stories about Comparing

Key Words: more, fewer

Lesson 1-6 Problem Solving: Use Objects

Key Words: related, fact family