1.CA.1

Demonstrate fluency with addition facts and the corresponding subtraction facts within 20. Use strategies such as counting on; making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g., 13 – 4 = 13 – 3 – 1 = 10 – 1 = 9); using the relationship between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 – 8 = 4); and creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13). Understand the role of 0 in addition and subtraction.

I Can Statements Academic Vocabulary

I can fluently add within 20 by counting on.
I can fluently add within 20 by making a group of ten.
I can fluently add within 20 using the relationship between addition and subtraction.
I can fluently add within 20 by creating easier, known sums.
I can fluently subtract within 20 by counting back.
I can fluently subtract within 20 by decomposing a number leading to a ten.
I can fluently subtract within 20 by using the relationship between addition and subtraction.
I can demonstrate the role of 0 in addition and subtraction.

Decompose
Sum
Difference
Addend
Addition
Subtraction

Looking Back Looking Ahead

Use objects, drawings, mental images, sounds, etc., to represent addition and subtraction within 10. (MA.K.CA.1)

Add and subtract fluently within 100. (MA.2.CA.1)