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7th Grade Math / Lesson 7: Rounding

ROUNDING
What will we be learning in this lesson?


  • In this lesson you will review how to round numbers to an appropriate place.


ROUNDING


  • Rounding is what you must do if a number or an answer is longer than what you need it to be.
  • First you must know the place values of numbers.
  • Look at the number below and the place values of the digits.


ROUNDING


  • Whatever position you are supposed to round to, you need to look at the number AFTER it to determine what to do.
  • Round 56.749 to the hundredths place. First, identify which digit is in the hundredths place. In this number, it is the 4.
  • Now look at the number AFTER the 4. It is a 9.
  • See the next slide for the rules for what to do next.


ROUNDING


  • The rules for rounding are as follows:

  • If the number you are looking at is 5 or higher, you round your number up to the next value.
  • If the number you are looking at is under 5, leave your value alone

    Remember to drop the end digits off after you round.


  • So 56.749 would round to 56.75


ROUNDING


  • Round the following to 1 decimal place. (This is telling you that your answer should only have one number past the decimal point.)

    243.629

    67.28

    56.749


ROUNDING


  • Round the following to 1 decimal place. (This is telling you that your answer should only have one number past the decimal point.)

    243.629
    Look at the 2. Leave the 6.                       243.6
    67.28
    Look at the 8. Change the 2 to a 3.          67.3
    56.749
    Look at the 4. Leave the 7.                       56.74