## 2021 Oregon Math Guidance: 3.GM.B.3

**Cluster: 3.GM.B - Solve problems involving measurement and estimation. **

## STANDARD: 3.GM.B.3

### Standards Statement (2021):

Tell, write, and measure time to the nearest minute. Solve problems in authentic contexts that involve addition and subtraction of time intervals in minutes.

### Connections:

Preceding Pathway Content (2021) | Subsequent Pathway Content (2021) | Cross Domain Connections (2021) | Common Core (CCSS) (2010) |

2.GM.D.10 | N/A | N/A | 3.MD.A.1 3.GM.B Crosswalk |

### Standards Guidance:

Clarifications

- Students should be given opportunities to determine relative time and predict time to the nearest fifteen minutes using only the hour hand of an analog clock.

#### Boundaries

- Students may use tools such as clocks, number line diagrams, and tables to solve problems involving time intervals.

#### Teaching Strategies

- Students will have opportunities to representing the problems in different ways, including using a number line diagram.
- Problems should include am/pm, start unknown, end unknown, and change unknown and addition/subtraction of time intervals.
- Students should be given opportunities to use number lines to find unknowns.

#### Examples

- The bus comes at 7:00 a.m. It takes me 15 minutes to eat breakfast and 30 minutes to get ready. What time do I need to wake up? (e.g., start unknown)
- I went to the movies at 3:15 p.m. The movie lasted 1 hour 45 minutes. What time did the movie end? (e.g., end unknown)
- After school I went to the park at 2:30 p.m. and left to go home at 3:45 p.m. How long was I at the park? (e.g., change unknown)
- Student Achievement Partners: