## The Metric System Exercise

1. Change to grams:

(a) 28.3 kg (b) 0.73 mg (c) 5628 cg (d) 7.1 hg

2. Change to ml:

(a) 5.3 kL (b) 62 L (c) 0.63 dL (d) 8.7 hL

3. Change to km:

(a) 5000 m (b) 62 Dm (c) 0.327 cm (d) 462 hm

4. Complete the table:

 kilometres metres centimetres millimetres 5 0.3 80

5. Give the most suitable unit for measuring:

(a) The weight of a bag of potatoes.

(b) The distance from Christchurch to Dunedin.

(c) The volume of medicine on a teaspoon.

(d) The thickness of a piece of glass.

(e) The amount of water in a 50 m long swimming pool.

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

choose the most suitable unit to measure:

(a) The length of a car.

(b) The capacity of a petrol tank.

(c) The volume of a sugar lump.

(d) The area of the windscreen.

(e) The weight of the wheels.

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

(b) The thickness of a piece of cardboard.

(c) The height of a building.

(d) The distance between Auckland and Wellington.

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

(a) 2.00 p.m.

(b) 7.15 a.m.

(c) 12.35 a.m.

(d) 10.53 p.m.

9. Convert the following 24 -hour clock times into a.m. and p.m. time:

(a) 1800

(b) 0345

(c) 1552

(d) 0037

10. At 0915 the temperature was 12 oC. At 1647 on the same day the temperature had gone up to 21.5 oC.

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 7.30 a.m. The winner completes the swimming section in 57 minutes. The cycling leg takes 1 hour and twelve minutes and the running leg takes 49 minutes. The changeover between each leg takes 4 minutes. How long does the winner take to complete the event and at what time does she finish?