It's a real mixed bag of questions this week, including probability, multiplying decimals and negative numbers. The first two questions look at probability when rolling a die. For instance; what is the probability of rolling a five? To work this out you need to know the total number of possibilities, in this case there are 6 (1, 2, 3, 4, 5 and 6) and that to roll a 5 is just one of those six possibilities, so the answer is one in six. This can also be written as a fraction 1/6 or as a decimal 0.17, or as a percentage 17%. The questions on multiplying fractions by 100 are straightforward as long as children don't think that they need to 'add a nought' when multiplying by ten. (3.5 x 10 is not 3.50) To multiply by 100 just move each digit two places to the left. perhaps a little harder is the question; 'How many times larger is 3600 than 36, which involves a similar mental process of working out how many places the digits have moved. We have also published our year 4 and year 5 mental arithmetic questions for this week.