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Lessons 5-6
LO: I can subtract like
fractions and solve word
problems involving the
addition of like
fractions.
Essential Questions:
How can equivalent fractions help me add and subtract fractions?
Vocabulary
• like fraction – fractions with
the same denominator
• numerator – the number
above the line of a fraction,
showing the number of parts
of the whole
• simplify – to reduce the
numerator and denominator in
a fraction to the smallest
numbers possible
• ⅜, ⅝, ⅞
Example
=
4
5
- 3
5
1
5
Solve.
=
7
9
- 2
9
5
9
Solve.
=
7
10
- 5
10
2
10
1
5
Solve.
=
20
33
-
17
33
1
11
3
33
Solve.
=
7
8
+
5
8
3
8
Notes
• To subtract fractions with like denominators:
1. Line up the fractions.
2. Subtract the numerator. --
3. Keep the denominator the same
4. Be sure to simplify the fraction
5. If the difference is an improper fraction, write
it as a mixed number
Solve.
Barb and Janet ordered a pizza. Barb ate
of the pizza. Janet ate of the pizza. How
much more of the pizza did Barb ate than
Janet?
=
3
8
-
2
8
1
8
of a pizza
Solve.
Asia covers about of the world’s land area.
Africa covers about of the world’s land
area. How much more of the world’s land
area does Asia cover than Africa?
=
3
10
-
2
10
1
10
Solve.
Rich bought of a pound of sausage and
of a pound of hamburger. How much more
meat did Rich buy than a hamburger?
=
3
4
-
2
4
1
4
pounds of meat
Group 1
Group 2
Group 3
Wrap-Up
• At the bottom of your notes, write one
sentence summarizing today’s lesson.
• In order to subtract fractions with
common denominators………

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Subtract Like Fractions.ppt

  • 1. Lessons 5-6 LO: I can subtract like fractions and solve word problems involving the addition of like fractions. Essential Questions: How can equivalent fractions help me add and subtract fractions?
  • 2. Vocabulary • like fraction – fractions with the same denominator • numerator – the number above the line of a fraction, showing the number of parts of the whole • simplify – to reduce the numerator and denominator in a fraction to the smallest numbers possible • ⅜, ⅝, ⅞
  • 8. Notes • To subtract fractions with like denominators: 1. Line up the fractions. 2. Subtract the numerator. -- 3. Keep the denominator the same 4. Be sure to simplify the fraction 5. If the difference is an improper fraction, write it as a mixed number
  • 9.
  • 10.
  • 11.
  • 12.
  • 13. Solve. Barb and Janet ordered a pizza. Barb ate of the pizza. Janet ate of the pizza. How much more of the pizza did Barb ate than Janet? = 3 8 - 2 8 1 8 of a pizza
  • 14. Solve. Asia covers about of the world’s land area. Africa covers about of the world’s land area. How much more of the world’s land area does Asia cover than Africa? = 3 10 - 2 10 1 10
  • 15. Solve. Rich bought of a pound of sausage and of a pound of hamburger. How much more meat did Rich buy than a hamburger? = 3 4 - 2 4 1 4 pounds of meat
  • 19.
  • 20. Wrap-Up • At the bottom of your notes, write one sentence summarizing today’s lesson. • In order to subtract fractions with common denominators………