1.OA.6

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).

Double facts within 10

Double Facts within 10

Model part-part whole

Model Part-Part Whole

Make a number

Make a Number

Make a ten

Make a Ten

Double facts within 20

Double Facts within 20

Subtract 1

Subtract 1

Subtract 2

Subtract 2

Subtract 3

Subtract 3

Subtract 4

Subtract 4

Subtract 5

Subtract 5

Subtract 6

Subtract 6

Subtract 7

Subtract 7

Subtract 8

Subtract 8

Subtract 9

Subtract 9