Measuring Mass
Est. Class Sessions: 3
Students use standard masses and a two-pan balance to measure the mass of several small objects. Students compose and decompose numbers, compare quantities, apply properties of addition, and solve addition and subtraction problems involving mass.
Content in this Lesson
- Composing and decomposing numbers using ones, fives, tens, and
twenties [E1]. - Using words to show comparisons of quantities [E2].
- Comparing and ordering quantities [E3].
- Recognizing that different partitions of a number have the same total [E4].
- Applying the commutative and associative properties of addition to write number sentences that represent mass [E5].
- Solving addition and subtraction problems involving mass [E6].
- Measuring and comparing the mass of objects using a two-pan balance and standard gram masses [E7].
- Collecting and organizing data.
- Making and interpreting a scaled bar graph [E10, 11].
- Connecting mathematics and science to real-world situations: measuring mass.
- Using labels to show what numbers mean [MPE6].
Daily Practice and Problems I–N
Materials for Students
| Daily Practice and Problems | Lesson | Homework | Assessment | ||
|---|---|---|---|---|---|
Student Books |
Student Activity Book |
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Teacher Resources |
Teacher Guide - digital |
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Supplies for Student Pairs
standard gram mass set (one 100-g, two 50-g, ten 20-g, ten 10-g, fifteen 5-g, twenty 1-g masses)
two-pan balance (zeroed in Lesson 1)
4 small objects, each having a mass less than 100 grams. See Materials Preparation.
1 object of approximately 100 grams. See Materials Preparation.
desk number line (0–100)
counters, optional
Materials for the Teacher
Display of Measuring Mass Data Table on the
Measuring Mass pages (Student Activity Book) Page 404
Display of Measuring Mass Graph (Student Activity Book) Page 405
set of standard metric masses (one 100-g, two 50-g, ten 20-g, ten 10-g, fifteen 5-g, twenty 1-g masses)
two-pan balance (zeroed in Lesson 1)
4 small objects less than 100 grams. See Materials Preparation.
1 object of approximately 100 grams. See Materials Preparation.
Unit 8 Assessment Record
Math Facts Class Record
class number line (0–130)
large marshmallow or cotton ball
several extra rocks about 50 grams, optional. See Materials Preparation.
Materials Preparation
Prepare Two-Pan Balances. Assemble the two-pan balances, if necessary. Demonstrate how to zero the balance (make the pans level) and then have students zero the two-pan balance to help them build understanding of how this measurement tool works.
Gather Objects to Mass. Each student pair will need 4 small objects, each having a mass of less than
100 grams. See Figure 1. Student pairs will also need 1 object with a mass near 100 grams. Do not offer
objects that are more than
110 grams. See Figure 2. You will also need 4 small objects and one object of
about 100 grams to mass for demonstration. Students will find the mass of each object. If you have a
collection of different small objects, students can share the objects. Alternatively, you can provide four
identical objects for each group (e.g., each group has a flat, a piece of chalk, a ruler, and a pencil) and
one larger object that varies from group to group.
Figure 1: Approximate masses of small objects
Figure 2: Objects with masses of about 100 grams
Gather Extra Pet Rocks. Students will be asked to bring in a rock of about 50 grams in mass. Find some extras to have on hand in case students forget. Students may also share rocks if necessary.
Assessment in this Lesson
| ASSESSMENT | EXPECTATION ASSESSED | MATH PRACTICES EXPECTATION ASSESSED |
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Measuring Mass with Feedback Box Student Activity Book Pages 403–411 |
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Pet Rock
Student Activity Book Pages 413–414 |
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DPP Item I Fact Families Teacher Guide - digital |
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