Unit 8
A C T I V I T Y 19
AC TIVIT Y
Ounces and Pounds
Use after
Unit 8, Session 3.6
Vocabulary/Vocabulario
25 MIN
CLASS
Display items that can be used to help students estimate and compare weights using
ounces and pounds. You might display the following: 60 small paper clips
(about 1 ounce), 5-pound bag of flour, book or loaf of bread (that weighs about
1 pound), an orange (about _13 pound), and 2 full-sized pencils (about _12 ounce).
Place 60 paper clips in a plastic bag.
Hold up an orange and the plastic bag containing 60 paper clips. This bag has
60 paper clips and weighs about 1 ounce. Do you think the orange is lighter or
heavier than the paper clips?
ounce/
onza
pound/
libra
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)
• book or loaf of bread that
weighs about 1 pound/
un libro o una hogaza de pan que
pesen aproximadamente 1 libra
• Activity 19 Master (see below)/
Actividad 19 (ver abajo)
CVbZ
Un i t 8
9ViZ
Twos, Fives, and Tens
KD9;IÅ7D:ÅEKD:I
Place the paper clips on one side of a pan balance scale and the orange on the other.
What do you notice about the side of the scale with the orange? What do you
think that means?
Activity 19
MASTER
NOTE Students cut out pictures of objects,
estimate the weights of the objects, and arrange
them in order from lightest to heaviest.
8jidjii]Ze^XijgZh#<ajZi]Zb^c
dgYZg[gdbi]Za^\]iZhiidi]Z]ZVk^Zhi#
Hold up a book. This book weighs 1 pound . 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 book or the orange?
Place the bag of paper clips, the orange, the pencils, the book, and the flour 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 their weight, we will use this [spring] scale to
weigh them and see how close our estimates are to the actual weights.
© Pearson Education, Inc. 1
© Pearson Education, Inc. 1
“I think it’s lighter because there are more paper clips.”
“I think it’s heavier because a paper clip is very light.”
Use after Unit 8, Session 3.6
PR AC TICE
In the Activity 19 Master, students are asked to order a collection of objects from
lightest to heaviest.
DIFFERENTIATION : Suppor ting the Range of Learner s
Display a collection of everyday objects. For each item, ask if the item’s
weight would normally be given in ounces or in pounds. Have students estimate the
weights, and then use a scale to find the weights.
Unit 8: Twos, Fives, and Tens
Session 3.6 (End-of-Unit Assessment)