4.2 Homework due 21.9.15

Complete neatly in the front of your books. Calculator allowed but working must be shown. Total: 23 marks

1. A milkman has a 12% pay increase to £15,000. What was his old salary?

   [3 marks]

2. The number of insects on a corpse increases by 25% every hour. At 9am there were 1000 insects on the corpse.
   1. How many insects were there at 10am?
   2. How many insects were there at 11am?
   3. Roughly how many insects will there be by midday?

   [6 marks]

3. A pair of trainers costs £35 AFTER a discount of 45%. How much were they before the discount?

   [3 marks]

4. A paperboy has his wage increased by 15% to £6.65 per hour. What was his wage before it was increased??

   [3 marks]

5. Without a calculator, find the value of \[ \frac{3.2 \times 10^{-4}}{4 \times 10^6} \] Give your answer in standard form.

   [2 marks]

6. Change $\frac{3}{25}$ into standard form showing ALL your working

   [2 marks]

7. Show all your working out for:
   1. $3\dfrac{2}{3} - 1\dfrac{6}{7}$
   2. $1\dfrac{2}{5} \times 4\dfrac{3}{8}$

      [4 marks]