Common Core
1.MD.A.1
3 lessons teach this standard. Every lesson is interactive, and every one prints as a worksheet with a separate answer key.
Grade 1 Math · Chapter 6 · Lesson 1
Line them up at the same end first.
Grade 1 Math · Chapter 6 · Lesson 2
Compare two things that cannot be moved.
Grade 1 Math · Chapter 6 · Lesson 3
Shortest, middle, longest.