Represent and solve problems involving addition and subtraction within 20.

Standard:

MA.1.NSO.2.1

Description:

Recall addition facts with sums to 10 and related subtraction facts with automaticity.

Standard:

1.OA.C.5

Description:

Relate counting to addition and subtraction (e.g., by counting on 2 to add 2).

Standard:

1.OA.C.6

Description:

Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. 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).

Standard:

MA.1.NSO.2.2

Description:

Add two whole numbers with sums from 0 to 20, and subtract using related facts with procedural reliability.

Standard:

MA.1.NSO.2.5

Description:

Explore subtraction of a one-digit number from a two-digit number.

Standard:

1.3.D

Description:

apply basic fact strategies to add and subtract within 20, including making 10 and
decomposing a number leading to a 10;