Common Core
K.NBT.A.1
3 lessons teach this standard. Every lesson is interactive, and every one prints as a worksheet with a separate answer key.
Kindergarten Math · Chapter 6 · Lesson 1
What a teen number really is.
Kindergarten Math · Chapter 6 · Lesson 2
Making any teen number you like.
Kindergarten Math · Chapter 6 · Lesson 3
The extras decide.