Succeed with maths – Part 2
Succeed with maths – Part 2

Start this free course now. Just create an account and sign in. Enrol and complete the course for a free statement of participation or digital badge if available.

Free course

Succeed with maths – Part 2

2.3 Decimal coordinates

Marking a scale with fractions of whole units allows us to plot points using decimal coordinates such as (1.8, –2.1).

In Figure 9 below, each unit along the axes has been divided into ten, so each grey line represents a tenth of a whole unit, or 0.1. Point A has the coordinates (1.3, 0.8), as it is plotted 1.3 units across to the right of the origin and 0.8 units up.

Described image
Figure 9 Decimal coordinates

Now, we’ve done the first point for you, complete the coordinates for the other points shown in the next activity.

Activity 3 Reading decimal coordinates

Timing: Allow approximately 5 minutes

Write down the coordinates for the points B and C on the graph above.

Answer

B is plotted at the point which is 3 intervals to the left of the origin on the horizontal scale and 4 intervals past the 1 mark on the vertical scale, i.e. opposite -0.3 on the x-axis and opposite 1.4 on the y-axis. So the coordinates of B are (-0.3, 1.4)

Similarly, the coordinates of C are (-1.5, 0.9).

Skip Your course resources
SWMB_2

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 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