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Add & Subtract Fractions (Like Denominators)
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What you will learn from this videoWhat you will learn
- We'll learn how to add and subtract fractions with the SAME denominator.
- We will also learn how to add and subtract MIXED NUMBERS with the SAME denominators.
- And we’ll see how this knowledge can help us plan fun trips, reorganize our room, and even figure out how much snow fell in a week!
- Discussion Questions
Before Video
Use a fraction to represent one slice of a pie that is cut into 5 equal pieces.ANSWER[ggfrac]1/5[/ggfrac]
ANSWER9 slices
6
12
[ggfrac]7/8[/ggfrac]
After Video
Why can’t Gino add [ggfrac]3/4[/ggfrac] to [ggfrac]2/3[/ggfrac]? ANSWERThey are not the same-sized units. It is like adding apples and oranges.
He added the denominators. He should only add the numerators.
3 whole pies and [ggfrac]4/6[/ggfrac] of a pie.
Method 1: 1 + 2 = 3, [ggfrac]1/3[/ggfrac] + [ggfrac]1/3[/ggfrac] = [ggfrac]2/3[/ggfrac], 3 + [ggfrac]2/3[/ggfrac] = 3[ggfrac]2/3[/ggfrac]
Method 2: 1[ggfrac]1/3[/ggfrac] = [ggfrac]4/3[/ggfrac], 2[ggfrac]1/3[/ggfrac] = [ggfrac]7/3[/ggfrac], [ggfrac]4/3[/ggfrac] + [ggfrac]7/3[/ggfrac] = [ggfrac]11/3[/ggfrac] = 3[ggfrac]2/3[/ggfrac]
It is easier to solve the problem by turning the mixed numbers into improper fractions.
- Vocabulary
- Fraction DEFINE
A number that represents a part of a whole.
- Numerator DEFINE
The number above the line in a fraction, which tells us how many parts we have.
- Denominator DEFINE
The number under the line in a fraction, which tells us how many parts the whole is split into.
- Mixed number DEFINE
A number made of a whole number and proper fraction.
- Proper fraction DEFINE
A fraction where the numerator is less than the denominator.
- Improper fraction DEFINE
A fraction whose numerator is greater than its denominator.
- Simplify DEFINE
Turn an improper fraction into a mixed number.
- Fraction DEFINE
- Reading Material
- Practice Word Problems
- Practice Number Problems
- Lesson Plan
- Teacher Guide
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Level 1
[ggfrac]3/9[/ggfrac] + [ggfrac]4/9[/ggfrac] = ?
Level 2
5[ggfrac]5/6[/ggfrac] - 3[ggfrac]2/6[/ggfrac] = ?
Level 3
3[ggfrac]4/5[/ggfrac] + 2[ggfrac]2/5[/ggfrac] = ?
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