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Estimating is an important part of mathematics and a very handy tool for everyday life. Get in the habit of estimating amounts of money, lengths of time, distances, and many other physical quantities.

Rounding off is a kind of estimating.

To round off decimals:

  1. Find the place value you want (the "rounding digit") and look at the digit just to the right of it.
  2. If that digit is less than 5, do not change the rounding digit but drop all digits to the right of it.
  3. If that digit is greater than or equal to five, add one to the rounding digit and drop all digits to the right of it.

To round off whole numbers:

  1. Find the place value you want (the "rounding digit") and look to the digit just to the right of it.
  2. If that digit is less than 5, do not change the "rounding digit" but change all digits to the right of the "rounding digit" to zero.
  3. If that digit is greater than or equal to 5, add one to the rounding digit and change all digits to the right of the rounding digit to zero.

Move your mouse cursor over each digit in the number below to round the number to that place.

 

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 ·  Place value

 ·  Decimal numbers

 ·  Estimating and
    rounding

 ·  Adding / subtracting
    decimals

 ·  Multiplying decimals

 ·  Dividing decimals

 ·  Percent

 ·  Exponents

 ·  Square roots

 ·  Signed integers

 ·  Adding and
    subtracting integers

 ·  Multiplying and
    dividing integers

 ·  Properties of integers


First Glance In Depth Examples Workout
First Glance   In Depth   Examples   Workout

Estimating and rounding decimals