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11 CHAPTER 3CHAPTER 3

Constructing a Pictograph

58 NEL

Construct and interpret pictographs.

? How should Pedro display his data in a pictograph?

Goal

Title:

Which Dinosaur Do You Like Best?

Number Dinosaur of people

tyrannosaurus rex 60

triceratops 45

brachiosaurus 25

velociraptor 50

other 20

Pedro’s Data

I asked people which dinosaur they like best. I will make a pictograph to display the data I collected.

Gotta find a footprint, a bone, or a tooth

To grab yourself a piece of dinosaur truth.

All the dino knowledge that we’ve ever known

Comes from a footprint, a tooth, or a bone.

JEFF MOSS

Gotta F ind a Footpr intGotta F ind a Footpr int

You will need

• a pictograph frame

• graphing software • a computer

03-NEM-Gr4-Chap03 7/18/03 4:47 PM Page 58

NEL 59

A. How many symbols should triceratops have? Explain.

B. Is a footprint the best symbol to use or would a bone, a tooth, or another symbol be better? Explain.

C. Make a pictograph to show the dinosaur data. Use a different scale than Pedro. Write the title and show the scale you used.

Pedro’s Pictograph

I chose a footprint symbol to represent the number of people who like each dinosaur.

My scale is “Each means 10 people.”

I drew 6 footprints for tyrannosaurus rex, but I don’t know how many to draw for triceratops.

Which Dinosaur Do You Like Best?

tyrannosaurus rex

triceratops

Each means 10 people.

1. What scale did you use for your pictograph? Explain your thinking.

2. How many symbols did you use for brachiosaurus? Why?

3. What do you need to know about the data before you can choose a scale for a pictograph?

ReflectingReflecting

03-NEM-Gr4-Chap03 7/18/03 4:47 PM Page 59

Checking 4. The chart shows some data for you to

display in a pictograph. a) What symbol will you use to represent

the number of visitors? Why? b) How many people will 1 symbol

represent on your pictograph? Explain your choice of scale.

c) Make the pictograph. Include the title and the scale.

Practising 5. Dinosaur bones were found at many sites.

Use this pictograph to answer the questions.

a) Which site had the greatest number of bones? Which site had the least number of bones?

b) Make a chart to show how many bones were found at each site.

c) How many bones were found at site E? Explain how you know.

d) Why do you think the person who made this graph used a circle symbol instead of a bone?

e) Make a new pictograph of the data that uses a different scale.

60 NEL

Number of Dinosaur Bones Found

site A

site B

site C

site D

site E

Each means 20 bones.

Visitors to the Dinosaur Show

Day Number of visitors

Monday 150

Tuesday 300

Wednesday 200

Thursday 225

Friday 450

03-NEM-Gr4-Chap03 7/18/03 4:47 PM Page 60