Common Core
1.MD.A.2
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 4
No gaps and no overlaps.
Grade 1 Math · Chapter 6 · Lesson 5
Bigger units give a smaller number.
Grade 1 Math · Chapter 6 · Lesson 6
Find the difference between two lengths.