Estimation Rules

Front

What is estimation in mathematics?

Back

Estimation is the process of finding an approximate value that is reasonably close to the actual value. It is often used when exact calculations are not necessary.

Front

How do you estimate the total cost of items?

Back

To estimate the total cost, round each item's price to the nearest whole number and then add those rounded values together.

Front

What is rounding?

Back

Rounding is the process of adjusting a number to make it simpler and easier to work with, usually to the nearest ten, hundred, thousand, etc.

Front

How do you round a number to the nearest ten?

Back

Look at the digit in the ones place. If it is 5 or more, round up. If it is less than 5, round down.

Front

What is the nearest thousand of 3,434?

Back

3,000

Front

What is the nearest ten of 163,261?

Back

163,260

Front

If Cindy earns $27 a week, how much does she earn in a year?

Back

$1,404 (rounded to $1,500 for estimation).

Front

What is the best estimate for the total cost of a movie ticket (£5.95), popcorn (£3.85), and a drink (£1.25)?

Back

£11 (rounded from £10.05).

Front

What is the purpose of estimation?

Back

Estimation helps to quickly assess the size or value of something without needing exact calculations.

Front

What is a practical example of estimation?

Back

Estimating the time it will take to complete a task, like homework, by rounding the time for each subject.