Reference no: EM133259668
Use a factor tree or similar method to write 3960 as a product of prime factors.
Display your factor tree in your answer. If you choose to use an alternative method, then clearly show your work: just writing down the answer is not sufficient.
Calculate 7 9 - 1 3 + 13 18 , leaving your answer as a fraction in its simplest form, showing all your working.
Simplify the surd 3 √ 7 √ 21 + √ 48 by writing it as a surd in its simplest form, showing your working.
A group of 441 students are required to take a test. Of these, 392 actually take the test, and 49 are absent that day.
(i) Write down the ratio of the number of students who take the test to the number of students who are absent. Simplify this ratio as far as possible.
(ii) Of the 392 students who take the test, the numbers of students obtaining grades A, B, C and D are in the ratio 5 : 12 : 8 : 3, respectively. Calculate the number of students obtaining each grade. Explain how you could check that your answers are plausible