# Lesson 13

Center Day 2 (optional)

### Lesson Purpose

The purpose of this lesson is for students to skip-count by 2, 5, and 10 and to add and subtract within 1,000.

### Lesson Narrative

This lesson is optional because it is an opportunity for extra practice that not all classes may need. In this lesson students have another chance to practice skip-counting by 2, 5, and 10 and addition and subtraction within 1,000.

### Learning Goals

Teacher Facing

• Add and subtract within 1,000 using strategies based on place value and the properties of operations.
• Skip-count by 2, 5, and 10.

### Student Facing

• Let’s skip-count and practice addition and subtraction.

### Required Materials

Materials to Gather

### Required Preparation

Activity 1:

Gather materials from:

• Write Numbers, Stage 4
• Target Numbers, Stages 6 and 7
• Five in a Row, Stages 7 and 8
• How Close, Stage 4

### Lesson Timeline

 Warm-up 10 min Activity 1 40 min Lesson Synthesis 10 min

### Teacher Reflection Questions

Identify something you thought was going to go well in math class recently, but did not. What can you do to make it a success the next time?