## Lesson 10 Double-digit minus single-digit – Using Ten as a Stepping Stone

**Part 1**: Follow along with your instructor. Review the Tens (Zone 1). Then, review the Ten and Another strategy.

**Part 2**: Follow along with your instructor. Review counting up to find the difference.

**Part 3**: Follow along with your instructor. Use 10 as a Stepping Stone for subtraction

### Worksheet for the lesson

Lesson 10 Double-digit minus single-digit worksheet pdf download## Lesson 11 Double-digit minus single-digit – Using Ten as a Stepping Stone

**Part 1**: Follow along with your instructor. Find 10 and use it as a Stepping Stone to find the difference. This way, you avoid counting one by one, and you turn subtraction problems into easier addition problems. These problems are from Zone 3 of the addition chart (double digit minuend).

**Part 2**: Follow along with your instructor. Use 10 as a Stepping Stone to find the difference.

### Worksheet for the lesson

Lesson 11 Double-digit minus single-digit worksheet pdf download## Lesson 12 Double-digit minus single-digit – Using Ten as a Stepping Stone

**Part 1**: Use 10 as a Stepping Stone to subtract 9. Find the patterns that help you solve and memorize these facts. (HINT: Look at the “think” lines.)

**Part 2**: Use 10 as a stepping stone to subtract 8. Find the patterns that help you solve and memorize these facts.

**Part 3**: Use 10 as a stepping stone to subtract 7. Find the patterns that help you solve and memorize these facts.