options: Relate addition and subtraction to length.

Geometric measurement: understand concepts of area and relate area to multiplication and to addition.

Geometric measurement: understand concepts of angle and measure angles.

Solve problems involving measurement and estimation of intervals of time, liquid volumes, and masses of objects.

Geometric measurement: recognize perimeter as an attribute of plane figures and distinguish between linear and area measures.

Describe and compare measurable attributes.

Classify objects and count the number of objects in each category.

Work with time and money.

Tell and write time.

Measure and estimate lengths in standard units.

Geometric measurement: understand concepts of volume and relate volume to multiplication and to addition.

Convert like measurement units within a given measurement system.

Measure lengths indirectly and by iterating length units.

Represent and interpret data.

Solve problems involving measurement and conversion of measurements from a larger unit to a smaller unit.
problem_activity: Narrative
In this activity, students encounter another type of elapsed-time problem in which the start and end times are given but the elapsed time is not. Students consider possible strategies they saw earlier that could be used to find elapsed time. Although they are not required to solve the problem, students may choose to do so as they think about ways to reason abstractly and quantitatively about the solution (MP2).
Launch
Groups of 2
Read the problem as a class.
“How is this problem like the ones we saw earlier?” (They are all about the passing of time and are related to riding the bus. The start time is given in all of them.) “How is this one different?” (The arrival time is given here, and the amount of time that has passed is missing.)
1 minute: quiet think time
Share responses.
Activity
“How would you solve this problem? Explain which strategies or representations you saw earlier that would be useful for solving a problem like this.”
5–7 minutes: independent work time
Student Facing
Here’s another problem about time:
At 6:32 p.m., Elena got on a bus to go home. She got off the bus at 7:10 p.m. How long was her bus ride?
Which strategy or representation would you use when solving a problem like this? Explain your reasoning.
Student Response
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Activity Synthesis
Invite students to share their reasoning and strategies. Display or record different representations for all to see.


correct_option_index: 3