Domain

Operations and Algebraic Thinking

Cluster

Add and subtract within 20.

Standard

NC.1.OA.6

Add and subtract, within 20, using strategies such as:

·       Counting on

·       Making ten

·       Decomposing a number leading to a ten

·       Using the relationship between addition and subtraction

·       Using a number line

·       Creating equivalent but simpler or known sums

Materials

SF, pencil

Task

Read aloud the prompt.  If your friend did not know the answer to 8 + 6, how would you tell him to figure it out?  Explain the steps he should take.

Continuum of Understanding

Not Yet Proficient

Response includes 0-1 of the descriptors in “Meets Expectations”

Strategies:

❑    Counting on

❑    Making ten

❑    Decomposing a number leading to a ten

❑    Using the relationship between addition and subtraction

❑    Using a number line

❑    Creating equivalent but simpler or known sums

Progressing

Response includes 2 of the descriptors in “Meets Expectations”

Meets Expectations

Response includes all the descriptors in “Meets Expectations”

●   Correctly explains steps using a strategy other than counting all

●   Strategy leads to a correct answer of 14

●   Explanation of the strategy is clear