Common Core
K.OA.A.2
4 lessons teach this standard. Every lesson is interactive, and every one prints as a worksheet with a separate answer key.
Kindergarten Math · Chapter 3 · Lesson 1
Adding is joining.
Kindergarten Math · Chapter 3 · Lesson 2
A faster way to add.
Kindergarten Math · Chapter 3 · Lesson 3
Two plus five is the same as five plus two.
Kindergarten Math · Chapter 4 · Lesson 1
Some go, some stay.