write the Rules of subtraction in unlike numbers.
Answers
Answer:
Rules for Subtracting Fractions
Rule 1: The fractions must have a common denominator.
What this means is that the denominators, or the bottom numbers, of the fractions, must be the same, what we call common denominators. If they are not the same, then we will find the common denominator and make them the same.
Rule 2: Once you have a common denominator, it does not change.
In other words, when you are subtracting your fractions, you are only subtracting the numerators, or the numbers on top.
Rule 3: Simplify the answer, if necessary.
If your answer has a numerator and a denominator that share a common factor, use that factor to reduce the fraction.
Example with Like Denominators
Here's an example of a fraction subtraction problem that already has common denominators:
Fraction Subtraction with Model
fraction subtraction with model
Since the denominators are the same, the only thing you have to do is subtract the top numbers! The denominator stays the same. So for this problem, 2 - 1 = 1, then the 3 stays the same so
2/3 - 1/3 = 1/3
Example with Different Denominators
Let's look at this fraction subtraction problem with different denominators:
7/8 - 1/4 = ?
By using equivalent fractions, fractions that look different but actually represent the same number, we can find the common denominator and can turn 1/4 into 2/8, which now has the same denominator as 7/8.
Equivalent Fraction of 1/4 = 2/8
Equivalent Fraction
So, 1/4 = 2/8. Here's a picture!
Equivalent Fraction and Subtraction Model
Equivalent Fraction and Subtraction Model
Now that you have found the equivalent fraction to 1/4 (2/8), you are ready to subtract!
Step-by-step explanation:
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