Unit 5
A C T I V I T Y 29
AC TIVIT Y
Customary Measures of Weight
Use after
Unit 5, Session 4.7
Vocabulary/Vocabulario
• book/
libro
• pencils/
lápices
• pan balances with ounce and
pound weights/
balanzas de platillos con pesas de
1 onza y 1 libra
• key/
una llave
• baseball mitt/
un guante de beisbol
• bathroom scale/
una balanza de peso
• kitchen scale/
una balanza de cocina
• weight labels from fruit packages/
etiquetas de peso de envoltorios
de verduras
• Activity 29 Master (see below)/
Actividad 29 (ver abajo)
© Pearson Education, Inc. 3
Ask students to place a pencil in one hand and
a book in the other. Which is heavier? When we
measure how heavy something is, we are finding
its weight. About how many pencils do you
think would equal the weight of the book?
Since we can’t weigh everything in pencils or in some other object, we use
standard units of weight, such as the ounce and the pound. Display a key and
a baseball mitt. The key weighs about 1 ounce. The mitt weighs about 1 pound.
There are 16 ounces in 1 pound. Write “1 pound ⫽ 16 ounces.”
Materials/Materiales
Un i t 5
GROUPS
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 weight is [number of pencils] pencils.
weight/
peso
ounce/
onza
pound/
libra
tons/
toneladas
CVbZ
25 MIN
Activity 29
MASTER
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Equal Groups
NOTE Students choose appropriate
customary units and measures of weight.
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Name some things that either weigh about 1 ounce or about 1 pound.
Students might say:
“An eraser probably weighs about 1 ounce.”
“A loaf of bread weighs about 1 pound.”
Very heavy objects are weighed in tons. A large horse can weigh about 1 ton.
There are 2,000 pounds in 1 ton. Write “1 ton ⫽ 2,000 pounds.” Name some things
that are probably measured in tons.
Give each group a pan balance and some ounce and pound weights. Have students
estimate the weights of some objects. Then demonstrate and have students take turns
weighing the objects. Light objects should be weighed to the nearest ounce; heavier
objects to the nearest pound. Have students measure some objects in pounds and ounces.
Display a bathroom scale and a kitchen scale. This bathroom scale measures weight
in pounds. The kitchen scale measures weight in pounds and ounces. Where else
have you seen such scales? Display some weight labels, pointing out that the weights
are given in decimal form.
Tell students that elevators have signs telling how much weight they can carry safely. Do
you have to know every person’s weight before you know whether the elevator is
safe, or is an estimate good enough?
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PR AC TICE
In the Activity 29 Master, students choose appropriate customary units and
measures of weight.
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Use after Unit 5, Session 4.7
Unit 5: Equal Groups
3 pounds ⫽
2 tons ⫽
Have students find equivalent measures with exercises such as these:
ounces
1 pound 6 ounces ⫽
ounces
pounds
1 ton 500 pounds ⫽
pounds
Session 4.7 (End-of-Unit Assessment)