Approximation and Estimation Summary

Approximation and Estimation

Summary

when making calculations or taking measurements, numbers often have to be approximated or estimated.

numbers can be approximated to the nearest whole number, nearest ten, nearest hundred, etc. 
or 
to a certain number of decimal places.

this is done by 'rounding off' a number.

Key Skills
  • round a number to the nearest whole number, nearest ten, etc.
  • approximate an amount to a certain number of decimal places
  • estimate the value of numbers and the answers to problems before using a calculator

Vocabulary

approximation, estimation, significant figures, decimal places.