Ratio, proportion and percentages

This free course is available to start right now. Review the full course description and key learning outcomes and create an account and enrol if you want a free statement of participation.

Free course

# 3.2.1 Try some yourself

## Activity 20

Convert each of the following to percentages. Round off the percentages to whole numbers.

• (a)

• (i) 0.8

• (ii) 0.21

• (iii) 0.70

• (iv) 2.4

• (b)

• (i)

• (ii)

• (iii)

• (iv)

### Answer

• (a)

• (i) 0.8 = 80%

• (ii) 0.21 = 21%

• (iii) 0.70 = 70%

• (iv) 2.4 = 240%

• (b)

• (i)    = 0.5= 50%

• (ii)    = 0.125=12.5% 13%

• (iii)     0.1111 11%

• (iv)     1.143 114%

## Activity 21

In the election in Example 11 the Average party gets 2100 votes. In the previous election they had 10%. Find the swing.

### Answer

2100 out of 5000 is

× 100% = 42%.

The swing is 42 − 10 = 32 percentage points.

MU120_4M3

### Take your learning further

Making the decision to study can be a big step, which is why you'll want a trusted University. The Open University has nearly 50 years’ experience delivering flexible learning and 170,000 students are studying with us right now. Take a look at all Open University courses.

If you are new to university level study, find out more about the types of qualifications we offer, including our entry level Access courses and Certificates.

Not ready for University study then browse over 900 free courses on OpenLearn and sign up to our newsletter to hear about new free courses as they are released.

Every year, thousands of students decide to study with The Open University. With over 120 qualifications, we’ve got the right course for you.

Request an Open University prospectus