Unit 8
A C T I V I T Y 20
AC TIVIT Y
Grams and Kilograms
Use after
Unit 8, Session 3.6
Vocabulary/Vocabulario
25 MIN
CLASS
Display items that can help students estimate and compare weights using grams and
kilograms. You might display: one nickel (about 5 grams), 100 small paper clips
(about 50 grams), an orange (about 150 grams), 10 full-sized pencils (about 275 grams),
a loaf of bread (about 500 grams, or half a kilogram), and a 1-liter bottle of water
(about 1 kilogram).
Place 100 paper clips in a plastic bag. Hold up an orange and the bag containing
100 paper clips. This bag has 100 paper clips and weighs about 50 grams.
Do you think this orange is lighter or heavier than the paper clips?
grams/
gramos
kilogram/
kilogramo
Students might say:
Materials/Materiales
• 2-pan balance and spring scale
(not included in the kit)/
balanza de 2 platillos y balanza
de resortes (no incluidas en
el estuche)
• 100 small paper clips and other
objects to weigh/
100 clips pequeños y otros
objetos para pesar
• Activity 20 Master (see below)/
Actividad 20 (ver abajo)
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Un i t 8
NOTE Students tell if an object should be
weighed in grams or in kilograms.
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Place the paper clips on one side of the pan balance and the orange on the other.
What do you notice about the side of the pan balance with the paper clips? What
do you think that means?
Activity 20
MASTER
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Twos, Fives, and Tens
“I think it’s lighter because there are more paper clips.”
“I think it’s heavier because a paper clip is very light.”
Hold up an orange and a bottle of water. This bottle of water weighs 1 kilogram.
Do you think it is lighter or heavier than the orange? After students have made
their estimates, place one object on each side of the pan balance. Which is heavier, the
bottle of water or the orange?
Place the orange, pencils, bottle of water, nickel, and paper clips on a desk. We are
going to estimate the weight of these objects and put them in order from lightest
to heaviest. After we estimate each weight, we will use this spring scale to weigh
the object and see how close our estimates are to the actual weights.
Use after Unit 8, Session 3.6
PR AC TICE
In the Activity 20 Master, students are asked to tell if an object should be weighed
in grams or in kilograms.
DIFFERENTIATION : Suppor ting the Range of Learner s
Display a collection of pictures of everyday objects. Have students
tell if the objects should be weighed in grams or kilograms. Then have students order
the objects from lightest to heaviest.
Unit 8: Twos, Fives, and Tens
Session 3.6 (End-of-Unit Assessment)