Learning outcomes

After studying this course, you should be able to:

• round a given whole number to the nearest 10, 100, 1000 and so on

• round a decimal number to a given number of decimal places or significant figures

• use rounded numbers to find rough estimates for calculations

• use a calculator for decimal calculations involving +, −, × and ÷, giving the answer to a specified accuracy (e.g. decimal places or significant figures) and checking the answer by finding a rough estimate

• check the answers to calculations by ensuring that the correct calculation has been done, in the correct order.