Common Core
1.OA.B.4
8 lessons teach this standard. Every lesson is interactive, and every one prints as a worksheet with a separate answer key.
Grade 1 Math · Chapter 3 · Lesson 1
Find the part that is missing.
Grade 1 Math · Chapter 3 · Lesson 2
Hop from the part to the whole and count the hops.
Grade 1 Math · Chapter 3 · Lesson 4
You can see one part. Work out the other.
Grade 1 Math · Chapter 3 · Lesson 5
You know the start and the end. What happened in between?
Grade 1 Math · Chapter 3 · Lesson 6
Three numbers make four sentences.
Grade 1 Math · Chapter 3 · Lesson 8
Your partners to ten work backwards too.
Grade 1 Math · Chapter 3 · Lesson 9
Mix them up and pick your own way.
Grade 1 Math · Chapter 5 · Lesson 6
Break the teen number apart and take from the ten.