# Lesson 10-12 Double-digit minus single-digit (worksheets)

## 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

## 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.

## 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.