Curriculum  /  Math  /  3rd Grade  /  Unit 7: Measurement  /  Lesson 4

Measurement

Lesson 4

Math

Unit 7

3rd Grade

Lesson 4 of 12

Objective

Solve word problems involving elapsed time within the same hour.

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.

Criteria for Success

  1. Solve word problems involving addition and subtraction of time intervals in minutes, e.g., by representing the problem on a number line diagram, where the times fall within the same hour, including the following three cases:
    1. Where the end time is unknown, 
    2. Where the start time is unknown, and 
    3. Where the duration is unknown (MP.1, MP.4). 

Tips for Teachers

  • "[A]n open number line can be a useful tool to help students visualize and organize the information” given in elapsed time problems and find their solution ("Dajuana's Homework", Illustrative Mathematics). (Examples of open number lines to solve elapsed time problems can be found in Lesson 5 Anchor Task 1.) Further, “[t]here are many different ways that students will approach these problems with open number lines, so teachers should anticipate allowing for multiple solution methods in class" ("Dajuana's Homework", Illustrative Mathematics).
  • No matter what, avoid having students try to solve these problems as they would typical addition and subtraction problems, since base 60 (as is the case with minutes and hours) is very challenging to compute in. This will be all the more relevant in Lesson 5, when solutions require students to cross an hour mark (e.g., find the amount of elapsed time between 4:30 p.m. and 5:13 p.m.).
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Anchor Tasks

25-30 minutes

Problem 1

a.   Henry starts riding his bike at 3:10 p.m. He rides for 35 minutes. What time does he stop riding his bike?

b.   Alfonso starts exercising at 7:20 a.m. He finishes exercising at 7:45 a.m. How many minutes did Alfonso exercise?

c.   Cassie goes swimming for 30 minutes. She finishes swimming at 1:50 p.m. What time did she start swimming?

Guiding Questions

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Student Response

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References

EngageNY Mathematics Grade 3 Mathematics > Module 2 > Topic A > Lesson 4 — Concept Development

Grade 3 Mathematics > Module 2 > Topic A > Lesson 4 of the New York State Common Core Mathematics Curriculum from EngageNY and Great Minds. © 2015 Great Minds. Licensed by EngageNY of the New York State Education Department under the CC BY-NC-SA 3.0 US license. Accessed Dec. 2, 2016, 5:15 p.m..

Modified by Fishtank Learning, Inc.

Problem 2

a.   Joe finishes his chores at 5:42 p.m. It took him 28 minutes to complete them. What time did he start doing his chores?

b.   Lucia’s math class started at 10:18 a.m. She worked for 33 minutes. What time was it when Lucia’s math class ended?

c.   Leslie starts reading at 11:27 a.m. She finishes reading at 11:54 a.m. How many minutes does she read?

Guiding Questions

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Student Response

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References

EngageNY Mathematics Grade 3 Mathematics > Module 2 > Topic A > Lesson 4 — Concept Development

Grade 3 Mathematics > Module 2 > Topic A > Lesson 4 of the New York State Common Core Mathematics Curriculum from EngageNY and Great Minds. © 2015 Great Minds. Licensed by EngageNY of the New York State Education Department under the CC BY-NC-SA 3.0 US license. Accessed Dec. 2, 2016, 5:15 p.m..

Modified by Fishtank Learning, Inc.

Problem Set

15-20 minutes

Discussion of Problem Set

  • How are #2 and #3 different? How did it affect the way you solved each problem? 
  • Did you count forward or backward to solve #5? How did you decide which strategy to use? 
  • How did you solve #7? What other counting strategies could you use with the clocks to get the same answer? 
  • How did you solve #8? How might you solve it without using a number line or a clock? 
  • How did we use counting as a strategy to problem solve today? 

Target Task

5-10 minutes

Before a movie starts, a theater plays some movie trailers. The trailers start at 8:05 p.m. and end at 8:24 p.m. How long are the movie trailers? 

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 that involves crossing the hour mark.

Lesson 5
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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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