Mathematics Measurement: Lesson 3 - Grade 8 (Page 4 of 9) in pdf

Mathematics Measurement: Lesson 3 - Grade 8 Page 4

Say:

What unit would you use to measure the mass of the following items?

A. The weight of a grown dog (kilograms)

B. The weight of a elephant (kilograms)

C. The weight of a computer (kilograms)

D. The weight of a potato (grams)

E. The weight of a sack of potatoes (kilograms)

F. The weight of a paper clip (gram)

G. The weight of an eyelash (milligram)

þ Find an object that weighs about one kilogram and some other objects

that weigh more or less than a kilogram. (You need to weigh these objects

ahead of time.) Have several students hold the one-kilogram object in one

hand and another object in the other hand.

Say:

Does the other object weigh more or less than one kilogram? Don’t use

objects that are similar in weight. Keep trying objects around the room. Do

the same activity with grams.

Say:

There are no metric mass conversions on the Reference Table.

Remember that the prefixes are the same for weight as for length. The

reference sheet shows 1 kilometer = 1,000 m, so how many grams in 1

kilogram? (1000 grams) The reference sheet shows 1 millimeter = 0.001

meters, so how many grams does 1 milligram equal? (0.001 grams)

þ Give Student Sheet 25 to the students. Talk about each problem.

Answers:

1) D

2) C

3) more

4) less

5) g

6) g

7) kg

8) mg

9) multiply

10) divide

11) <

12) >

13) D

14) A

þ In this part, you will focus on capacity.

Say:

Capacity is the measure of how much will fit into a container. When

might you need to find the capacity of a container. (when buying milk or

sodas, when taking cough syrup, when measuring vanilla to make a cake)

Grade 8 Mathematics

Lesson 3, Measurement

Mathematics Measurement: Lesson 3 - Grade 8 Page 4

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