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

 ODE and Oregon Math Project Logo

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


 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.


Preceding Pathway Content (2021)

Subsequent Pathway Content (2021)

Cross Domain Connections (2021)

Common Core (CCSS)






3.GM.B Crosswalk

 Standards Guidance:


  • 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.


  • 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.


  • 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: