Fractions A Great Big Piece of Fun.

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Presentation transcript:

Fractions A Great Big Piece of Fun

Fractions Fractions were invented to express numbers that are in between whole numbers. Fractions can show measures between whole numbers on rulers or scales.

Fractions Fractions can name part of a whole object or part of a collection of objects. whole collection

Fractions Fractions can express chance or probability - 1 out of 3 chance (1/3) Fractions can represent division ¾ = 3÷4 = .75 Most fractions are fractions of “something” referred to as the whole, one, or unit.

(a little more than half) Fractions The number on the bottom of the fraction is called the denominator. The denominator tells you how many parts the whole is divided into. 5/9 = 5 out of 9 total pieces (a little more than half)

Fractions The numerator is the number on the top part of the fraction. The numerator names the number of parts under consideration. ½ = 1 out of 2 parts

Fractions For this activity, you will need a partner. Each pair will need 20 counters and page 122. We will be working together as a class. Please do not work ahead.

Fractions On this sheet, there are three types of problems: Whole and part are given and the solution requires you to name the fraction. 8 puppies and 3 of them are girls. What fraction of the puppies are girls? Complete problems 1 and 2

Fractions Whole is given and the fraction is named. The solution requires you to name the part. If Joe has 21 coins, how many coins would be in 1/7 of his collection? Complete problems 3, 4, and 7

Fractions The part is given and the fraction is named. The solution asks for the value of the whole. If $5.00 is 1/5 of the ticket price, what is the total cost of the ticket price? Complete problems 5, 6, and 8

Fractions How can a ruler teach us about fractions? Each inch on a ruler is broken into equal pieces. The inch would be the unit or whole. The hash marks between each inch would be the fractions of the inch.

} One Inch

} One Half Inch

Each inch is broken into 8 equal pieces or eighths (1/8)

If each inch is broken down into eights, how many eighths in one-half an inch?

If each inch is broken down into eights, how many eighths in one-quarter an inch? 1 inch = 8/8 ½ inch =4/8 ¼ inch = 2/8

How many different names can ½ have on your ruler? Look at your ruler. What fractional part is each inch broken into? How many different names can ½ have on your ruler?

Let’s play a game called Mastermind