Kindergarten:
​Addition and Subtraction to 5 

+1

-1

Neighbor
​Numbers (=1)

+0, -0, =0

Sums of 10

Grade 1:
Addition and Subtraction to 10

+1

-1

Neighbor
Numbers (=1)

+0, -0, =0

+2

-2

=2

Doubles

Halves

Grade 2:
Addition and Subtraction to 20

+1

-1

Neighbor
Numbers (=1)

+0, -0, =0

+2

-2

=2

Doubles

Halves

Grade 3:
Multiplication and Division to 100

Doubles (x2)

Halves (÷2)

Grade 4:
Multiplication and Division to 144