# Lesson 4

Comparemos números en una recta numérica

### Lesson Purpose

### Lesson Narrative

In previous lessons, students learned how to locate a number on the number line and represent numbers with labeled tick marks and points. They used multiples of 5 and 10 to help them locate numbers up to 100 on a number line.

In this lesson, students recognize that as you move to the right on the number line, numbers increase in value because they are a greater distance from 0. Students also use the relative position of numbers and generalize that a number that is greater than a given number if it is farther to the right on the number line. To demonstrate this understanding, students compare numbers within 100 (a skill from grade 1) and use the number line to explain their comparison (MP7).

In a later lesson, students connect this understanding to movement on the number line, as they learn to represent addition as moving to the right and subtraction as moving to the left.

- Engagement

### Learning Goals

Teacher Facing

- Recognize that on a number line, the numbers increase to the right and decrease to the left.

### Student Facing

- Usemos la recta numérica para comparar números.

### Required Materials

Materials to Gather

Materials to Copy

- Number Line to 100

### Required Preparation

Activity 1:

- Each student will need their number line they made in Lesson 1.
- Each group of 2 needs 3 number cubes and 2 counters.

Activity 2:

- Each group of 2 needs 2 number cubes and a dry erase marker.
- Put number line recording sheets into sheet protectors. The recording sheets will be used in upcoming lessons.

### Lesson Timeline

Warm-up | 10 min |

Activity 1 | 20 min |

Activity 2 | 15 min |

Lesson Synthesis | 10 min |

Cool-down | 5 min |

### Teacher Reflection Questions

### Suggested Centers

- Five in a Row: Addition and Subtraction (1–2), Stage 6: Add within 100 with Composing (Supporting)
- How Close? (1–5), Stage 3: Add to 100 (Supporting)

### Print Formatted Materials

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Student Task Statements | docx | |

Lesson Cover Page | docx | |

Cool Down | Log In | |

Teacher Guide | Log In | |

Teacher Presentation Materials | docx | |

Blackline Masters | zip |