Fractions, Decimals, and Percents Karen Horace Mann Middle School

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.

What do they look like? Fraction Decimal Percent

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.

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

Decimals and percents Move the decimal point 2 places to the right = 0.25 = 25% 0.09 = 0.09 = 9%

Where in the world do we “see” fractions, decimals, and percents? Grocery store Baseball music

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.

At a baseball game: A player’s 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.

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.

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.