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# The Difference Between Mass and Customary Weight

Lesson 13 of 13

## Objective: SWBAT use their shared understanding of mass to estimate the mass of given objects.

#### Intro

*10 min*

*What is estimation? Why do we estimate? *Here we talk about approximate values, units and getting ‘close’ to the correct weight or amount.

*How many counters do you think I have in this cup? Now how much water do you think is in this cup? What about how much this glass apple weighs? *

We discuss how things can fill up a certain amount of space (liquid volumes) like pouring water into a cup, or how an object can have mass, which is different than weight.

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#### Building our Vocabulary

*20 min*

We create shared notes and definitions about the different between weight and mass because this can be a difficult idea for 8 and 9 year olds to grasp. I think it is important to take the time to do this so that we all have a shared resource that we can refer back to.

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#### Group Work

*15 min*

*Please number your paper 1-5. We are going to use what we know about estimating today, and you’re going to have to use some really good thinking skills with your group today to figure these out! Remember to discuss together and defend your answers and ideas with our accountable talk sentence stems (Mp3)*

*1. What is the mass of a penny?*

*2. What is the mass of a pencil?*

*3. What is the mass of a school bus?*

*4. What is the mass of a rhino?*

*5. What is the mass of Mrs. Maffei?*

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#### Close

*5 min*

*What did you guys discover today? What made this activity challenging? How is mass different from customary weight? *

We spend some time at the end discussing the challenges of deciding between weight and mass and discuss why we refer back to our notes and new vocabulary to help us, especially with a new or difficult concept.

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- UNIT 1: Crazy About Fractions
- UNIT 2: Sharing Equally with Division
- UNIT 3: The Relationship Between Multiplication and Division
- UNIT 4: Number Lines
- UNIT 5: Multiply or Divide with Word Problems
- UNIT 6: Telling Time
- UNIT 7: Problem Solving
- UNIT 8: 2-Digit by 1-Digit Multiplication
- UNIT 9: Measurement and Data
- UNIT 10: Math in the Real World
- UNIT 11: More Problem Solving Practice
- UNIT 12: Addition & Subtraction
- UNIT 13: 3rd Grade Expectations
- UNIT 14: Geometry
- UNIT 15: Surveys and Graphing
- UNIT 16: Fun with Multiplying and Dividing

- LESSON 1: Standard and Non-Standard Units of Measurement
- LESSON 2: What is the Perimeter?
- LESSON 3: Perimeter is All Around Us!
- LESSON 4: My Unique Perimeter Performance Task
- LESSON 5: Graphing with M&M's
- LESSON 6: Design Your Dream House
- LESSON 7: Comparing Lengths
- LESSON 8: What is Area?
- LESSON 9: Length x Width
- LESSON 10: Design Your Dream House- Day 2
- LESSON 11: Area With Halves
- LESSON 12: Area Assessment
- LESSON 13: The Difference Between Mass and Customary Weight