Fractions

1
Fractions
Brittany Haigh Class of 2007
3-23-07
2
Reducing Fractions

• Reduce the numerator (top number) and the
  denominator (bottom number) by the same number
• Ex. 4 /2 2
• 6 /2 3

3
Mixed Numbers changed to Improper Fractions

• A mixed number is a whole number with a fraction.
  Ex. 1 ¾
• An improper fraction is a fraction that is more
  than one. Ex. 7/4
• To change a mixed number to an improper fraction,
  you multiply the whole number by the denominator
  (bottom number of fraction). Ex. 1 ¾ 1 4 4
• Then add that number to the numerator (top number
  of fraction). Ex. 1 ¾ 4 3 7
• Then put that number over the original
  denominator. Ex. 1 ¾ 7/4

4
Adding Fractions

• To add fractions with the same denominator, just
  add the numerators together. (Dont forget to
  reduce.)
• Ex. 1 3 4 reduce it /4 1
• 8 8 8 /4 2
• To add fractions with different denominators,
  change the denominators to the same number. Then
  add the numerators together. Then reduce.
• Ex. 2 3 ? 2 7 14
  3 5 15
• 5 7 5 7 35
  7 5 35
• 14 15 29
• 35 35 35

5
Subtracting Fractions

• To subtract fractions with the same denominator,
  just subtract the numerators. (Dont forget to
  reduce.)
• Ex. 6 3 3
• 8 8 8
• To subtract fractions with different
  denominators, change the fractions so they have
  the same denominator. Then subtract the
  fractions.
• Ex. 5 - 2 ? 5 4 20 2 7
  14
• 7 4 7 4 28
  4 7 28
• 20 14 6 reduce /2 3
• 28 28 28 /2
  14

6
Multiplying Fractions

• To multiply fractions, multiply straight across.
  Then reduce.
• Ex. 1 7 ? 1 7 7
• 4 8 4 8 32

7
Dividing Fractions

• To divide fractions, flip the bottom fraction and
  multiply them. Then Reduce.
• Ex. 3 3 4 12
  3
• _4 _ 4 1 4
• 1
• 4