Measurement

Lesson 3

Math

Unit 7

3rd Grade

Lesson 3 of 12

Objective


Relate clocks to number lines.

Common Core Standards


Core Standards

  • 3.MD.A.1 — Tell and write time to the nearest minute and measure time intervals in minutes. Solve word problems involving addition and subtraction of time intervals in minutes, e.g., by representing the problem on a number line diagram.

Foundational Standards

  • 2.MD.B.6

Criteria for Success


  1. Partition a number line representing a time span of 1 hour into fractional parts of an hour, e.g., 5-minute increments. 
  2. Plot times given on a clock or in standard form (e.g., 1:45 p.m.) on a number line. 
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Anchor Tasks

25-30 minutes


Problem 1

Farida’s recess starts at the time displayed on the clock below. It ends at 1:45 p.m.

Plot points on the number line below that represent what time Farida’s recess starts and ends. Then explain how you decided where to plot them. 

Guiding Questions

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Student Response

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Problem 2

Plot the following times on the number line below. 

  1. 7:15 a.m.
  2. 7:55 a.m.
  3. 7:23 a.m.
  4. 7:39 a.m. 

Guiding Questions

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Student Response

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Problem 3

Plot the following times on the same number line. 

  1. 3:48 p.m.
  2. 3:37 p.m.
  3. 4:01 p.m.
  4. 4:14 p.m. 

Guiding Questions

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Student Response

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Problem Set

15-20 minutes


Discussion of Problem Set

  •  In #3, what information was important for plotting the point on the number line that matched the time shown on each clock? How did you decide on the endpoints? How did you decide where to plot each time based on those endpoints? 
  • In #4, the intervals were 10 minutes instead of 5 minutes. How was that similar to plotting times when the intervals were 5 minutes? How was it different? 
  • How is the number line similar to the analog clock? How is it different? 

Target Task

5-10 minutes


Plot points on the following number line that correspond with each time below. Label each point with its corresponding letter a–d. Be as precise as possible.

a.   5:45 p.m.

b.   

c.   6:12 p.m.

d.   

Student Response

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Additional Practice


The Extra Practice Problems can be used as additional practice for homework, during an intervention block, etc. Daily Word Problems and Fluency Activities are aligned to the content of the unit but not necessarily to the lesson objective, therefore feel free to use them anytime during your school day.

Word Problems and Fluency Activities

Word Problems and Fluency Activities

Help students strengthen their application and fluency skills with daily word problem practice and content-aligned fluency activities.

Next

Solve word problems involving elapsed time within the same hour.

Lesson 4
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Lesson Map

A7CB09C2-D12F-4F55-80DB-37298FF0A765

Topic A: Time Measurement

Topic B: Mass and Liquid Volume Measurement

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