### A Maths

At Penciltutor’s A-Maths tuition classes we remind our students to look out for hints in the question paper. If a question asks for a sketch, then plotting the graph on a graph paper is not necessary and by rationalising a surd-containing denominator, the final answer must always have a denominator that does not contain any surds. Other reminders that we give our students is to avoid making assumptions. An angle that ‘looks like a right angle’ is not necessarily a right angle and a + b/2 is not the same as (a + b)/2. Showing as much working as possible is always advisable as marks are not deducted for wrong working and brackets such as { } or ( ) have different meanings in mathematics. Precious marks are often lost when students fail to convert an equation such as y = ax^n into log y = nlog x + log a before plotting a curve and students who differentiate a quotient very often get mixed up with the terms on the top or bottom of the fraction. Other errors due to carelessness include substituting the bottom limit first into a definite integral expression and the failure to include the arbitrary constant c when solving indefinite integrals.

The suggested answers to the GCE O level Additional Mathematics (A Maths/ Add Maths) papers will be posted below. All solutions/ answers are provided by teachers of Penciltutor School and the Singapore MOE or UCLES bears no responsibility for these suggested solutions/ answers. As usual, if you find any errors in our solutions or if you need an explanation, kindly send an email to admin@penciltutor.com.

**2014 O Level Suggested Answers**

**2015 O Level Suggested Answers**

**2016 O Level Suggested Answers**

**2017 O Level Suggested Answers**

**2018 O Level Suggested Answers**

A Maths 4047 Paper 2 Q10 to 11