Round decimals and mixed numbers

Key Notes :

1. Rounding Decimals:

• Definition: Rounding a decimal means approximating it to a certain number of decimal places or significant figures.
• Rules for Rounding Decimals:
  • Look at the digit in the place value you are rounding to:
    • If the digit is 5 or greater, round up.
    • If the digit is less than 5, round down (or keep the digit the same).
• Example: Round 3.876 to two decimal places.
  • Look at the third decimal place (6). Since 6 is greater than 5, round the second decimal place (7) up to 8.
  • Answer: 3.88.

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2. Rounding Mixed Numbers:

• Definition: A mixed number consists of a whole number and a fraction. To round a mixed number, you round the fractional part and then simplify the whole number if needed.
• Steps for Rounding Mixed Numbers:
  1. Round the fractional part of the mixed number to the required decimal or fraction.
  2. Adjust the whole number if necessary (depending on the rounding of the fractional part).
• Example: Round 2 7/8 to the nearest whole number.
  • Convert the fraction to a decimal: 7/8 = 0.875.
  • Round 0.875 to the nearest whole number (which is 1 since it is greater than 0.5).
  • Answer: 3 (2 + 1 = 3).

Learn with an example

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