7 Core Mental Arithmetic Challenge What number is one hundred times bigger than nought point six? 6 60 600 What are eight thirties? 240 210 220 What is four thousand four hundred and fifty-nine to the nearest hundred? 4400 4500 4600 What is half of half of eighty? 40 20 10 What is fifty per cent of fifty pounds? £25 £10 £5 How many degrees are there in one tenth of a right angle? 9° 10° 90° How many sides has a pentagon? 7 6 5 If pears cost eleven pence each, how many can I buy for one pound? 8 9 10 Ready to send