## Lesson: Modeling and Recording Subtraction

Developing the Concept

Once children have had practice subtracting 1 from numbers 1 through 10, you can introduce the concept of subtracting 2 from a number. Then you can move on to vertical subtraction, subtraction facts to 10, and subtracting pennies. Once children have practiced various subtraction facts, provide them with problems where they must choose the operation.

**Materials:** overhead projector, 10 counters, 10 pennies; Workmat 1, 10 counters, 10 pennies, number cards 1−10 and symbol cards from Learning Tools 8 and 9, for each pair of children; Subtract (PDF file) worksheets for each child

**Preparation:** Prepare a copy of Workmat 1 for each pair of children. Prepare a Subtract (PDF file) worksheet for each child.

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

**Wrap-Up and Assessment Hints:**

You can assign each child or pair of children a number or set of numbers. Have them model and write subtraction sentences with minuends up to 10 and the number that you have assigned as the subtrahend. Have children use the “Subtract “ (PDF file) worksheet to record their subtraction sentences.