# Thinking About Instructions

1 Converting Metric And Imperial Capacity

Sometimes we will need to convert between metric capacity (millilitres and litres) and imperial capacity (fluid ounces, pints and gallons).

Here are some ROUGH CONVERSIONS

1 fluid ounce = 30 millilitres

1 pint = 600 millilitres

1 gallon = 4½ litres

1¾ pints = 1 litre

A. Using these rough conversions try to work out these:

1) 2 fluid ounces = ______ ml

7fl. oz = ______ ml

15fl. oz = ______ ml

½fl. oz = ______ ml

2) 3 pints = ______ ml or ______ litres

7 pints = ______ ml or ______ litres

½ pint = ______ ml

4½ pints = ______ ml or ______ litres

¼ pint = ______ ml

3) 2 gallons = ______ litres

5 gallons = ______ litres

½ gallons = ______ litres

4) 1 litre = 1¾ pints

2 litres = ______ pints

5 litres = ______ pints

7 litres = ______ pints

Now look at the conversion charts on the following pages:

The first one shows fluid ounces and millilitres.

B. Try answering these questions using the conversion chart. Your answers will be estimates.

1) Ron puts 4 fluid ounces of plant food into a pint of water.

What will these be in millilitres?

2) Michelle mixes 2 fluid ounces of cordial with water to make ½ pint of orange squash.

How much cordial does she use in ml?

How much water does she use in ml?

How much squash is there in ml?

3) A can of drink holds 330 millilitres, about how many fluid ounces is this?

4) If a recipe says you need ¾ pint of milk, how many fluid ounces will this be?

How many millilitres will it be?

5) A plastic cup in DISC holds 200 millilitres of water, how many fluid ounces is this?

600

575

550

525

500

475

450

425

400

375

350

325

300

275

250

225

200

175

150

125

100

75

50

25

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

6) 568 millilitres is the same as . . . . . . . . . . . . . . fluid ounces or

. . . . . . . . . . . . . . . . pint.

7) If a recipe uses 7 fl oz of water and your measuring jug only shows millilitres, how many millilitres will you need?

8) A medicine needs to be diluted in 100 mls of water. How many fluid ounces would that be?

9) A recipe for scones uses 5 fl oz of milk. How many mls would this be?

10) A baby milk feed has to be diluted in 240 mls of water. How many fluid ounces is this?

The next chart shows the conversion of litres and gallons.

Answer these questions using the chart over the page.

C.

1) (a) 10 litres = gallons

(b) 50 litres = gallons

(c) 30 litres = gallons

(d) 5 litres = gallons

(e) 5 gallons = litres

(f) 10 gallons = litres

(g) 11 gallons = litres

(h) 7½ gallons = litres

2) An average toilet uses 7 gallons per flush.

What is this in litres?

If you change to a water saving toilet it uses 3½ gallons.

How much is this in litres?

3) The average water consumption per day in India is 25 litres.

What is this in gallons?

In Britain we use 300 litres per person per day.

What is this in gallons?

4) A car petrol tank holds 8 gallons.

What is this in litres?

5) If you want to top up the tank by 6 gallons how many litres will you buy?

1 pint is 568 millilitres.

D.

1) How many millilitres will there be in a gallon (8 pints).

What is this to the nearest half litre?

2) If you drink 3 pints of beer, what will this be in millilitres?

3) A soup recipe uses 1½ pints of water.

How many millilitres is this?

4) A blood donor van collects 15 pints of blood for a local hospital.

How many ml is this?

How many litres will this be?

Check your answers, then discuss with your tutor what you need to work on next.

Answers

Converting Metric And Imperial Capacity

A 1) 2 fluid ounces = 60 ml

7fl. oz = 210 ml

15fl. oz = 450 ml

½fl. oz = 15 ml

2) 3 pints = 1800 ml = 1.8 litres

7 pints = 4200 ml = 4.2 litres

½ pint = 300 ml

4½ pints = 2700 ml = 2.7 litres

¼ pint = 150 ml

3) 2 gallons = 9 litres

5 gallons = 22½ litres

½ gallons = 2¼ litres

4) 2 litres = 3½ pints

5 litres = 8¾ pints

7 litres = 12¼ pints

B Do not worry if your answers are a few ml out.

1) 112 millilitres

2) 56 ml cordial

227 ml water

283 ml altogether

3) 12 fluid ounces

4) 15 fluid ounces

427 ml

5) 7 fl. oz

6) 20 fl. oz or 1 pint

7) 200 ml

8) 3½ fl. oz

9) 140 ml

10) 8½ fl. oz

C 1) 10 litres = 2 gallons (approx)

50 litres = 11 gallons

30 litres = 6½ gallons

5 litres = 1 gallons

5 gallons = 23 litres

10 gallons = 45.5 litres

11 gallons = 50 litres

7½ gallons = 34 litres

2) 32 litres

16 litres

3) 5½ gallons

11 gallons x 6 = 66 gallons

4) 36½ litres

5) 27 litres

D 1) 4544 ml = 4.5 litres

2) 1704 ml

3) 852 ml

4) 8520 ml = 8.52 litres

-----------------------

Fluid Ounces And Millilitres

Millilitres

Fluid Ounces

Litres Gallons

¼ pint

½ pint

¾ pint

1 pint

6

7

5

8

0

4

9

10

11

3

2

1

15

20

25

30

10

5

0

35

40

45

50

Litres

Gallons

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2

4

6

9

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