Estimation and Rounding
Why is it important?

Early estimation skills allow for comparisons and approximations to be made. The ability to round numbers helps carry out mental calculations. It also allows for quick estimations to be made in calculations and to check the reasonableness of a solution. In different contexts there will be varying degrees of accuracy required.
How is this used in real life contexts?
Estimating how much money will be needed for a weekend away.
Estimating the duration of a journey.
Estimating the number of cups of juice you will be able to get from a bottle.
The newspaper said 63,467 tickets have been sold for the game at Murrayfield – round this to thenearest 10, 100, 1000.
Estimate how long will it take to drive/walk/cycle to…