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.