Measures and conversions

• Length, volume, area, weight, temperature• Metric and Imperial• Some things here still in imperial - miles

and miles per hour, pints• Advantage of metric is the ease with which

one unit can be converted to another• Decimal system

Metric Units

• Kilo (k) means 1000 x• deci (d) means one tenth• hecto (h) means 100 x• deca (da) means 10 x• centi (c) means one hundredth • milli (m) means one thousandth

Imperial units

• 1 mile = 1760 yards• 1 yard = 3 feet• 1 foot = 12 inches• 1 ton = 20 hundredweight (cwt)• 1 cwt = 112 pounds (lb)• 1 stone = 14 pounds• 1 pound = 16 ounces (oz)

Imperial Units

• 1 gallon = 8 pints• 1 pint = 20 fluid ounces (fl oz)

Imperial Units

Convert 76” to feet and inches

Convert 6lb 5oz to ounces

Convert 18 pints to gallons

Conversion between Imperial and Metric units

• Sometimes necessary to convert between Imperial and metric units

• Often only a rough conversion required• For larger quantities or where a correct

figure is required, a more appropriate degree of accuracy is required

Conversion Factors

• 5 miles 8 km

• 1 metre 39 inches

• 1 foot 30.5 cm

• 1 litre 1.75 pints

• 1 litre 0.2 gallons

• 1 kg 2.2 lbs

• 1 mile = 1.609 km

• 1 yard = 0.914 m

• 1 foot = 30.48 cm

• 1 inch = 2.54 cm

• 1kg = 2.205 lb

• 1 litre = 1.76 pt

• 1 gallon = 4.55 litres

Conversions

A packet of sugar weighs 250g. What weight in ounces should be printed on the packet?

1kg = 2.205 lb

1000g = 2.205 x 16 oz = 35.28 oz

1 g = 0.03528 oz

250g = 0.03528 x 250 oz = 8.82 oz

Minimum weight of the sugar = 8.8 oz