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  • 1 metre  8 km 39 inches • 1 foot  • 1 litre  • 1 litre  30.5 cm 1.75 pints 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