Understands addition as putting together and adding to numbers within 20. Understands subtraction as taking apart and taking from numbers within 20. Understands addition and subtraction can be represented in an equation form.
2.0 retrieval

•  describe the terms ordering, grouping, sum, difference. 
• explain that counting relates to adding (through the use of a number line, objects, drawings)

• solve problems that include situations that represent addition and subtraction of numbers within 20.
•  show these situations in the form of an equation or drawing.

Understands that numbers to 10 can be decomposed into pairs in more than one way and recorded using a drawing or equation.

2.0 retrieval

• describe the terms: problems.                                                    
• can identify a number sentence

represent numbers less than or equal to 10 in pairs in more than one way, (e.g., by using objects or drawing), and record each number sentences with a drawing or equation (5=2+3;5=4+1).

​Ask students using paper and pencil or orally  to describe the following vocabulary  Then unpack definitions as necessary

addition  (a mathematical operation in which the sum of two numbers or quantities is calculated. Usually indicated by the symbol +)

subtraction

(Subtraction is a mathematical operation that represents the operation of removing objects from a collection. It is signified by the minus sign (−).

Ask them to describe what the following mean to them

  + , =, and  -

(The plus and minus signs (+ and −) are mathematical symbols used to represent the notions of positive and negative as well as the operations of addition and subtraction. Plus and minus are Latin terms meaning "more" and "less", respectively.)

Ask the students to describe

adding to

taking from (Subtraction in mathematics means you are taking something away from a group or number of things. When you subtract, what is left in the group becomes less.)

putting together, Excellent You Tube for understanding adding to,taking away and putting together)

  https://www.youtube.com/watch?v=UID5GYLI_lk

taking apart

to show addition and subtraction with objects, fingers, mental images, drawings, sounds or equations

Based on the understandings explain the meanings and post on charts