Unit 5
A C T I V I T Y 30
AC TIVIT Y
Metric Measures of Mass
25 MIN
GROUPS
Ask students to place a pencil in one hand and a book in the other. Which has a
greater mass? Mass is the amount of matter something contains. About how many
pencils do you think would equal the mass of the book?
Use after
Unit 5, Session 4.7
Vocabulary/Vocabulario
mass/
masa
gram/
gramo
kilogram/
kilogramo
We can find out how many pencils it will take
by using a pan balance. Place one of the books on
one side of the balance and enough pencils on the
other side to put the scale in balance. We can say
that the book’s mass is [number of pencils] pencils.
Display a paper clip and a large jar of peanut butter. The mass of the paper clip is
about 1 gram. The mass of the jar of peanut butter is about 1 kilogram.
Name some things that either have a mass of about 1 gram or about 1 kilogram.
Materials/Materiales
• pan balance with grams and
kilograms/
balanzas de platillos con gramos
y kilogramos
• large paper clip/
clips grandes
• large jar of peanut butter/
un frasco grande de mantequilla
de maní
• metric scale/
balanza métrica
• items labeled in grams and
kilograms/
objetos con etiquetas en gramos
y kilogramos
• Activity 30 Master (see below)/
Actividad 30 (ver abajo)
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Equal Groups
NOTE Students choose appropriate
metric units and measures of mass.
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There are 1,000 grams in 1 kilogram. Write “1 kilogram ⫽ 1,000 grams.” Advise
students that something with a mass of 1 kilogram would weigh a little more than
2 pounds (on earth). Would you measure your mass in grams or in kilograms? Explain.
Students might say:
“I would measure my mass in kilograms, because there would be too
many grams to measure.”
Give each group a pan balance and grams and kilograms. Have students estimate the
masses of some objects. Then demonstrate and have students take turns finding the mass
of each object. Light objects should be measured to the nearest gram; heavier objects to
the nearest kilogram. How can you change the kilogram measures to grams?
Display a metric scale and some items labeled in grams and kilograms. Discuss the
metric measures on the labels and where such scales are used.
PR AC TICE
*
“A feather probably has a mass of about 1 gram.”
“A book might have a mass of about 1 kilogram.”
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© Pearson Education, Inc. 3
© Pearson Education, Inc. 3
Activity 30
MASTER
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Un i t 5
Students might say:
In the Activity 30 Master, students choose appropriate metric units and measures
of mass.
800 g tomatoes
Use after Unit 5, Session 4.7
DIFFERENTIATION : Suppor ting the Range of Learner s
4,500 grams
8 kilograms
3 kilograms
Unit 5: Equal Groups
Have students use ⬍, ⬎, or ⫽ to complete sentences such as these:
4 kilograms
8,000 grams
3,700 grams
Session 4.7 (End-of-Unit Assessment)