Common Core

1.OA.B.3

11 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 4

Find every pair of parts that makes 6 or 7.

Grade 1 Math · Chapter 1 · Lesson 5

Find every pair of parts that makes 8 or 9.

Grade 1 Math · Chapter 1 · Lesson 8

Put it all together with picture and story problems.

Grade 1 Math · Chapter 2 · Lesson 4

Swap the parts and the total stays the same.

Grade 1 Math · Chapter 2 · Lesson 8

Use a double you know to work out one you do not.

Grade 1 Math · Chapter 2 · Lesson 9

Put every strategy together and spot the patterns.

Grade 1 Math · Chapter 5 · Lesson 1

Look for two that make ten first.

Grade 1 Math · Chapter 5 · Lesson 2

Move one across and the hard sum turns easy.

Grade 1 Math · Chapter 5 · Lesson 3

Now move two across.

Grade 1 Math · Chapter 5 · Lesson 4

Swap first, then make your ten.