Many students make a big mistake when describing numbers. For example, look at the graph below.
Now look at these four sentences:
- In 1985, Canada was about 19 million tonnes.
- Australia was lower, at 15 million tonnes of wheat exports.
- In 1988, Canada increased by about 5 million tonnes of wheat exports.
- Australia exported about 11 million tonnes of wheat in 1990.
Only one of these sentences is written correctly. Can you say which one is correct, and explain the big mistake in the other three?