## Lesson: Modeling and Recording Subtraction

Introducing the Concept

Children first learn the concept of subtraction by subtracting 1 from the numbers 1 to 10. At the Kindergarten level they will model subtraction by counting back and recording the number of items remaining.

**Materials:** overhead projector, counters, number cards for the numbers 0–10, and the minus sign and equals sign (Learning Tools 8 and 9 in the *Learning Tools Folder)*

**Preparation:** Prepare cards for numbers 0–10 and the minus and equals symbols.

**Prerequisite Skills and Concepts:** Children should be proficient in counting and recognizing numbers to 10. Children should have experience finding sums to 10.