Converting between Units Flashcards

All 7 cards in this deck

What are the metric conversions for length between mm, cm, m and km?

10 mm = 1 cm, 100 cm = 1 m, 1000 m = 1 km.

What are the metric conversions for mass between g, kg and tonnes?

1000 g = 1 kg, 1000 kg = 1 tonne.

What are the conversions between ml, litres and cm³?

1 ml = 1 cm$^3$, 1000 ml = 1 litre, so 1000 cm$^3$ = 1 litre.

When converting units, when do you multiply and when do you divide?

Multiply when changing to a smaller unit, divide when changing to a larger unit.
e.g. m to mm: $\times 1000$; cm to m: $\div 100$.

True or false? To change a mass in grams into kilograms you multiply by 1000.

False.
You divide by 1000, because a kilogram is the larger unit.

What are the steps to change a speed in metres per second into kilometres per hour?

e.g. 30 m/s

1. Multiply by 3600 for metres per hour: $30 \times 3600 = 108\,000$
2. Divide by 1000 for km per hour: $108\,000 \div 1000 = 108$
3. Answer: 108 km/h (or just multiply by 3.6)

True or false? $1\text{ m}^3$ of water is the same as 1000 litres.

True. $1\text{ m}^3 = 1\,000\,000\text{ cm}^3$ and $1000\text{ cm}^3 = 1$ litre, so $1\text{ m}^3 = 1000$ litres.