domingo, 11 de noviembre de 2007

Rounding numbers

How to round numbers
  • Make the numbers that end in 1 through 4 into the next lower number that ends in 0. For example 74 rounded to the nearest ten would be 70.
  • Numbers that end in a digit of 5 or more should be rounded up to the next even ten. The number 88 rounded to the nearest ten would be 90


  • You can round off a number in different ways: Example:
    to the nearest unit: 643,78 = 644,
    to the nearest 10 (ten) --> 643,78 = 640
    to the nearest 100 (hundred) --> 643,78 = 600
    to the nearest 1/10 (tenth) --> 643,78 = 643,8


    More interactive exercises:
    http://www.bbc.co.uk/education/mathsfile/shockwave/games/roundoff.html
    http://www.aaamath.com/est27a-rounding.html

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