Common Core
1.OA.D.8
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 1 · Lesson 6
Know fast how many more you need to make ten.
Grade 1 Math · Chapter 2 · Lesson 6
Work out the number that is hiding.
Grade 1 Math · Chapter 5 · Lesson 8
The box can be anywhere in the sentence.