Dinosaurs  Lesson 7: Nature and Change
ACTIVITY: Making a Pictograph
Objective
Students compare lengths to explore ratios and proportion.
Materials
 Sets of cutouts for each child to see the relative sizes of a human, a
twostory house, and a dinosaur
 Paper clips to make chains
Procedures
If the following heights are used as averages: six feet for a human, 18
feet for a twostory house, and 30 feet for the iguanodon, stegosaurus, or
triceratops, then the ratios will be 1:3 for a human to a house, and 3:5 as the
ratio of a house to an iguanodon.
If the students select a 40foot tyrannosaurus instead of an iguanodon, the ratio
is 1:3:7, of a human to a house, and a house to a tyrannosaurus.
For the 140foot dinosaur found in New Mexico, seismosaurus (earthshaker), the
ratio is 1:3: 23, still using the average for a human and a twostory house.
These chains, below, are in the ratio of 1:3:5:7:23
1. Using these proportions, the students make a pictograph on a chart.
2. The students measure pieces of string to the size of a person, a house, and a
dinosaur they select. Then they draw a scene with a house, a dinosaur, and a
person to show the three in ratio and perspective.
