800ml + 720ml = 1520ml = 1 litre and 520ml = 1.52 litres The bigger the denominator, the smaller the fraction 3/20 Perimeter PERIMETER is the distance round the outside of a shape On a centimetre square grid – count round Perimeter of this shape = 12cm Measurements given - add up all round 6cm 3/19 Add & subtract measures 4cm 4cm The units must be the same Length – Example 6cm Perimeter of this shape = 6 + 4 + 6 + 4 = 20cm 3/21 Bills and change 3cm + 7mm To work out a bill = 30mm + 7mm 1 chocolate bar - £1.10 = 37mm 1 pen – 10p or 3cm 7mm or 3.7cm 1 pencil – 8p 3cm 0.7cm Total = £1.28 Mass – Example To find change by the ‘add-on’ method +2p +20p +50p = 72p £1.28 £1.30 £1.50 £2.00 3kg – 450g = 3000g – 450g = 2550g 3/22 Time or 2kg 550g or 2.55kg Analogue clock 3/19 Add & subtract measures (continued) Roman Hindu-Arabic Volume – Example 12- and 24-hour clock
The bigger the denominator, the smaller the fraction 3/19 Add & subtract measures The units must be the same Length – Example 3cm + 7mm = 30mm + 7mm = 37mm or 3cm 7mm or 3.7cm 3cm 0.7cm Mass – Example 3kg – 450g = 3000g – 450g = 2550g or 2kg 550g or 2.55kg 3/19 Add & subtract measures (continued) Volume – Example 800ml + 720ml = 1520ml = 1 litre and 520ml = 1.52 litres 3/20 Perimeter PERIMETER is the distance round the outside of a shape On a centimetre square grid – count round Perimeter of this shape = 12cm Measurements given - add up all round 6cm 4cm 4cm 6cm Perimeter of this shape = 6 + 4 + 6 + 4 = 20cm 3/21 Bills and change To work out a bill 1 chocolate bar - £1.10 1 pen – 10p 1 pencil – 8p Total = £1.28 To find change by the ‘add-on’ method +2p +20p +50p = 72p £1.28 £1.30 £1.50 £2.00 3/22 Time Analogue clock Roman Hindu-Arabic 12- and 24-hour clock