PSLE stands for Primary School Leaving Examination. It is the sixth grade national examination in Singapore. It is compulsory for all children in Singapore to sit for this national test. From 2009 onwards, calculator use is permitted in part of the examination. Candidates may use a calculator to help them complete five short answer items (two marks each) and thirteen long-answer items (either three, four or five marks each). For short-answer items, it is not necessary to communicate the method in writing. Credit is given for a correct response. However, partial credit can be earned even if the final answer is incorrect if a correct method has been communicated. For the long-answer items, communication of solution mentod is necessary as the problems are fairly complex and/or novel. The level of difficulty of the paper remains the same,a ccording to a press release by MOE.