Common Core
1.OA.A.1
15 lessons teach this standard. Every lesson is interactive, and every one prints as a worksheet with a separate answer key.
Grade 1 Math · Chapter 1 · Lesson 3
Show two parts that make one whole.
Grade 1 Math · Chapter 1 · Lesson 8
Put it all together with picture and story problems.
Grade 1 Math · Chapter 2 · Lesson 1
Join two groups and write what happened.
Grade 1 Math · Chapter 3 · Lesson 1
Find the part that is missing.
Grade 1 Math · Chapter 3 · Lesson 3
Some go away, and you count what is left.
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 5 · Lesson 7
Use the same move on real problems.
Grade 1 Math · Chapter 6 · Lesson 6
Find the difference between two lengths.
Grade 1 Math · Chapter 6 · Lesson 8
Read a graph and answer questions from it.
Grade 1 Math · Chapter 8 · Lesson 6
Draw a story as two bars and the whole they make.
Grade 1 Math · Chapter 8 · Lesson 7
Find the missing part as well as the whole.
Grade 1 Math · Chapter 10 · Lesson 1
How Many More? How Many Fewer?
Match two groups up and see what is left over.
Grade 1 Math · Chapter 10 · Lesson 2
Draw a comparison as two bars from the same starting line.
Grade 1 Math · Chapter 10 · Lesson 9
Some problems try to lead you the wrong way.