Fractions With Unlike Denominators

1
LESSON 5-1 Warm Up
2
LESSON 4-4 Warm Up
3
Adding Rational Numbers (5-1)

• How do you add fractions with unlike
  denominators?

• To add fractions with unlike denominators
  (different-sized parts), change the fractions to
  equivalent fractions with the same denominators
  (same-sized parts). Then, add the numerators
  (number of parts). The denominators stay the
  same.
• w ? Write equivalent fractions with ?
  a common denominator (notice
  each
  fraction is multiplied by the other
  fractions denominator)
• ? Add the numerators. ?

4
Adding Rational Numbers (5-1)

• How do you change a mixed number into a decimal?
• How do you add decimals?

• To change a mixed number into its decimal form
  1. change the fraction to a decimal by dividing
  the numerator by the denominator and add the
  whole number to the decimal form of the fraction,
  or 2. make the mixed number an improper fraction
  and divide the numerator by the denominator
• Example
• To add decimals, line up the decimals. This will
  ensure that youre adding the same place values.
• Example Add 12.34 432.1 3.456
• 1. Line up the decimals

12.34 432.1 ______ 3.456___ .
. . _______ ._______ .
12.340 432.100 ______
3.456___ .
12.340 432.100 ______
3.456___ 447.896
5
Adding Rational Numbers
LESSON 5-1
Additional Examples
Find .
6
Adding Rational Numbers
LESSON 5-1
Additional Examples
A recipe calls for cup of white flour and
cup of wheat flour. How many cups of flour do you
need?
7
Adding Rational Numbers
LESSON 5-1
Additional Examples
Find 6.75 8 .
8
Adding Rational Numbers
LESSON 5-1
Lesson Quiz
Find each sum. 1. 2. 3. 7.875
4 4. It snowed 2 in. on top of 4.5 in.
of snow already on the ground. How deep
is the snow now?
5 8
7 in.