Conversion Graphs Flashcards

All 6 cards in this deck

What is a conversion graph?

A straight line graph used to convert between two quantities or units, e.g. pounds and euros.

What are the steps to use a conversion graph?

e.g. convert 20 miles to kilometres

1. Find 20 on the miles axis
2. Go vertically up to the line
3. Read horizontally across to the km axis: about 32 km

True or false? A conversion graph can be used to convert in both directions.

True.
Start on either axis, go to the line, then read off the other axis.

True or false? Every conversion graph passes through the origin.

False.
E.g. a °C to °F graph crosses at 32 °F when the temperature is 0 °C.

What does the gradient of a conversion graph represent?

e.g. euros (y-axis) against pounds (x-axis)

The conversion rate — how many of the y-unit there are per 1 of the x-unit.
Here: the number of euros per £1.

How can you use a conversion graph for a value larger than the graph goes up to?

e.g. convert 200 miles when the graph stops at 50 miles

Convert a value that fits, then scale up.
Read 50 miles $\approx$ 80 km, then $\times 4$ gives about 320 km.