Idea 16of 22Builds onA pictograph's key counts for many
Bigger pictures can fool the eye
Why is one bigger picture a sneaky way to show more?
Today you'll discover
- what happens when a picture grows taller
- why it grows wider too
- how much bigger it looks
Think firstWeek 2's carton is drawn twice as tall
How much bigger does Week 2's carton look than Week 1's?
Decide first, then press Next. Compare the space each picture covers.
Two milk cartons on a ground line: Week 1, 20 litres, small; Week 2, 40 litres, drawn twice as tall. A bracket shows it is 2 small cartons tall, another that it is 2 small cartons wide, then 4 dashed small cartons fill it. The last step shows trees: 10 last year, 30 this year, drawn 3 times as tall.
See the whole ideathe big idea and the key word, in one place
The big idea
A picture twice as tall and twice as wide looks 4 times as big.
The fair wayUse pictures that are all the same size, and draw more of them: 2 cartons for 40 L, 1 carton for 20 L.
Easy to get wrongWhen a graph shows one big picture and one small one, ask how many times as much the numbers say.
Key word
- area
- the amount of flat space a shape covers
Ready to use it?
- Spot a picture graph that grows its pictures.
- Say how many times bigger a picture looks.