## The Metric System Exercise

1. Give the most suitable unit for measuring:

 (a) The weight of a big fish. (b) The distance from London to Paris. (c) The amount of petrol in a car. (d) The distance around a running track. (e) The width of a school text book.

2. Using the set of units {cubic centimetres, litres, square centimetres, metres, kilograms}

choose the most suitable unit to measure:

 (a) The height of a person. (b) The volume of a person's hand. (c) The weight of a person. (d) The total area of a person's finger nails. (e) The amount of blood in a person's body

3. Using the set of units {kilometres, millimetres, metres, centimetres} choose the most suitable unit to measure:

 (a) The length of this page. (b) The thickness of a piece of cardboard. (c) The height of a building. (d) The distance from Mt Taranaki to Mt Ruapehu. (e) The height of a mountain
 4. Change to grams: (a) 28.4 kg (b) 0.94 mg (c) 6628 cg (d) 9.2 hg 5. Change to mL: (a) 6.4 kL (b) 62 L (c) 0.64 dL (d) 8.9 hL 6. Change to km: (a) 6000 m (b) 62 Dm (c) 0.429 cm (d) 462 000 mm

7. Complete the table:

 kilometres metres centimetres millimetres 6 0.4 80

8. Convert the following times into 24 -hour clock time:

(a) 2.00 pm
(b) 9.26 am
(c) 1.46 am
(d) 10.54 pm

9. Convert the following 24 -hour clock times into am and pm time:

(a) 2300
(b) 0446
(c) 1752
(d) 0049

10. At 0946 the temperature was 18.4 °C. At 1224 on the same day the temperature had gone up to 32.6 °C.

How long, in hours and minutes, was there between the two temperature readings and what was the difference in temperature?

 11. A triathlon starts at 9.40 am The winner completes the swimming section in 29 minutes. The cycling leg takes 1 hour and twelve minutes and the running leg takes 49 minutes. The changeover between each leg takes 3 minutes. How long does the winner take to complete the event and at what time does he finish?