Measurement and time provide the focus for the Year 4 mental arithmetic this week. Questions such as, 'What time is 45 minutes after 8.30?' can be answered in several different ways, all of which are correct. They include 9:15, a quarter past 9 and 15 minutes past 9. The measurement questions test knowledge of the number of metres in a kilometre and the number of centimetres in a metre. The Year 5 questions cover fractions, multiplication, differences and quotients. Finding a quarter of 66 litres is quite tricky and probably best done by halving and halving again. Half of 66 is 33. Half of 33 is 16 and 1/2. it is a good idea to practise halving odd numbers so children get used to having halves as part of the answer. Finally in year 6 it is revising addition and subtraction, but the questions demand considerable ability to get the correct answers. It is a good idea to go through these and discuss the best approach to take to ensure correct answers. Go to Year 4 mental arithmetic Go to Year 5 mental arithmetic Go to Year 6 mental arithmetic