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Measures Length Weight Capacity You need to know these units: millimeter (mm) gram (g) milliliter (ml) centimeter (cm) kilogram (kg) deciliter (dl) meter (m) ton centiliter (cl) kilometer (km)   liter (l) You need to know these equivalent measures: 1cm = 10mm 1m = 100cm 1m = 1000mm 1km = 1000m 1kg = 1000g 1 ton = 1000kg 1dl = 10ml 1cl = 100ml 1l = 1000ml = 100dl = 10cl Try to remember: deci = tenth part centi = hundredth part milli = thousandth part kilo = 1000 times the unit

Imperial units We mainly use metric measures, but there are some older units called imperial units that we sometimes use. For example, road signs always give distances in miles rather than kilometres. Here are the rough approximations between metric and imperial units: Length Weight Capacity 12 inches = 1 foot 16 ounces = 1 pound 8 pints = 1 gallon 2½ cm 1 inch 25g 1 ounce 1 liter 1¾ pints 30 cm 1 foot 2¼ 1kg 4½ liters 1 gallon

The area is the amount of surface a 2D shape covers. To work out the area of a shape, multiply its length by its breadth. The units we use to measure an area include square centimeters (cm²), square meters (m²) and square kilometers (km²).

The area of this square is: 5cm x 5cm = 25 cm².

The area of this rectangle is: 4cm x 6cm = 24cm².

It is more difficult to measure the area of irregular shapes. Look at this shape:

To measure its area: Count the squares that are wholly within the shape. 1, 2 Squares that are half or more in the shape count as whole ones. 3, 4, 5, 6, 7, 8, 9, 10 Don't count squares that are less than half in the shape. So the area is approximately 10cm²

Everyday Metric System               Metric Numbers to Remember