Fractions, Decimals, and Percents

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Fractions, Decimals, and Percents

• Karen
• Horace Mann Middle School

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What we will learn to do.

• Change a fraction to a decimal and to a percent.
• Show a picture of each type of number.
• Show where in the real world we can see a
  fraction, decimal, and/or percent.
• Decide which type of number is best for specific
  uses.

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What do they look like?

• Fraction
• Decimal
• Percent

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How do you change a fraction to a decimal and to
a percent?

• To change a fraction to a decimal, divide the top
  number by the bottom number.
• To change a decimal to a percent, multiply by
  100, or move the decimal point two places to the
  right.

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Fractions and Decimals

• Put the top number inside the division box, put a
  decimal point and a zero behind it and divide.
• ½ 2)1.0 0.5
• 2/5 5)2.0 0.4

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Decimals and percents

• Move the decimal point 2 places to the right.
• 0.25 0.25 25
• 0.09 0.09 9

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Where in the world do we see fractions,
decimals, and percents?

• Grocery store
• Baseball
• music

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In the grocery store

• Fruits are sold by the pound. Apples may cost
  1.29 per pound, so 3 ½ pounds would cost how
  much?
• To reduce your fat intake, you may choose to buy
  2 milk, 1 milk, or ½ milk.

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At a baseball game

• A players batting average is shown as a decimal.
  A batting average of .328 means that for every
  1000 times at bat the player has made 328 hits.
• A teams win/loss record can be written as a
  fraction (or a ratio). The Rangers record is 34
  to 65, or 34/65.

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In music

• Songs are written and played in 4/4, ¾, 2/4, and
  ¼ time.
• Music can be in 1/8 (eighth) notes, ½ (half)
  notes, ¼ (quarter) notes, etc.

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So you see

• Fractions, decimals, and percents are all
  different ways to represent the same thing.
• Sometimes one type of number is better to use for
  certain situations for example, decimals for
  batting averages, fractions for music, and
  decimals for money.