Lesson 9 Grams and Kilograms, Liters and Milliliters

- Let’s explore measurements in grams, kilograms, liters and milliliters.

Warm-up Which One Doesn’t Belong: Meter, Meter on the Page

Which one doesn’t belong?

2 m
2,000 meters
200 centimeters

Activity 1 A Whole Lot of Paper Clips

One paper clip weighs 1 gram.

picture of a paper clip

Problem 1

How many grams are the paper clips in each image?

Problem 2

The paper clips in this image weigh 1 kilogram.

image of 10 boxes of paper clips. 100 paper clips in each box.

What is the relationship between kilograms and grams?

Problem 3

Complete the table with the missing amounts in grams.

kilograms (kg)	grams (g)
$2$
$7$
$15$
$\frac{1}{2}$
$9 \frac{1}{2}$

Problem 4

Which weighs more? Be prepared to explain how you know.

8 kilograms or 8 boxes with 100 paper clips in each box
1,250 paper clips or 1 kilogram
500 grams or 2 boxes of 250 paper clips in each box
$\frac{1}{2}$ kilogram or 500 paper clips

Activity 2 Liters and Milliliters

picture of pink liquid in 4 different size containers. Volumes of liquid, 1 liter, 100 milliliters, 20 milliliters, and some in a medicine dropper.

Problem 1

Estimate: How many times do we fill the 100-milliliter glass to get 1 liter of liquid? (Assume that each time the liquid is filled to the 100-milliliter line.)
Write a sentence to describe the relationship between milliliters and liters.

Problem 2

How many times do we need to fill each of these containers to get 1 liter?

A 1-milliliter medicine dropper
A 250-milliliter measuring cup
A 20-milliliter cup

Problem 3

Complete the table with the missing amounts in liters or milliliters.

liters (L)	milliliters (mL)
$1$
$4$
$7$
$16$
	$500$
	$20, 000$

Practice Problem

Problem 1

A bottle of water holds 250 milliliters.
- How many of those bottles does it take to make 1 liter?
- How many liters of water does the bottle hold?
Jada’s backpack weighs 3.5 kg. How many grams is Jada’s backpack? Explain or show your reasoning.