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Intoduction to Fractions. What are FRACTIONS?. Fractions are a part of the whole We use fractions all the time. Have you ever used a steel tape or a ruler? Inches are divided into parts Have you ever used a measuring cup? Cups are divided into parts. 1 Numerator 4 Denominator.

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Presentation Transcript
what are fractions
What are FRACTIONS?
  • Fractions are a part of the whole
    • We use fractions all the time.
      • Have you ever used a steel tape or a ruler?
        • Inches are divided into parts
      • Have you ever used a measuring cup?
        • Cups are divided into parts
parts of fractions
1 Numerator

4 Denominator

The top number is the numerator.

The bottom number is the denominator.

Parts of fractions
types of fractions
Proper fractions – the top number (numerator) is SMALLER than the bottom number (denominator). THIS IS THE PROPER FORM FOR AN ANSWER.

Improper fractions – the top number is LARGER than the bottom number.

Mixed numbers – a whole number and a fraction.

1

2

3

2

1

4

Types of fractions

2

quick review
Quick Review
  • What are Fractions?
  • Part of the whole
  • The Top number is the _____________.
  • Numerator
  • The Bottom number is the ____________.
  • Denominator
  • What are the 3 types of fractions?
  • Proper Improper Mixed Numbers
think of a fraction as a pie
Think of a fraction as a pie

Pretend that you ate 3 pieces of a pie that was cut into 4 pieces

3

4

3 pieces that you ate

The pie was cut into 4 pieces

In fractions the bottom number (denominator) always refers to how many pieces something has been cut into.

The top number (numerator) always refers to how many pieces you have

slide7
Into how many pieces has this cake been cut?

How many pieces did Bob eat?

1

4

slide8
Into how many pieces has this cake been cut?

How many pieces did Bob eat?

3

8

slide9

7

15

  • Into how many pieces did Bob cut the cake?
  • How many pieces of the cake did Bob eat?

Therefore Bob ate 7/15 of the cake!