How do you compare two fractions with the same denominator?

Compare fractions with the same numerator or the same denominator (3.NF.A.3d) Compare two fractions with the same numerator or the same denominator by reasoning about their size. Recognize that comparisons are valid only when the two fractions refer to the same whole.
A.

How do you figure out which fraction is greater?

Compare 2/3 and 3/5 and find out which fraction is bigger.
1. First look at the denominators (the bottom numbers).
2. Find a new number that both denominators go into:
3. Now you have found a new denominator that is divisable by both numbers, you need to change the numerators (the top numbers).
• How do you add and subtract decimals?

1. Write down the numbers, one under the other, with the decimal points lined up.
2. Put in zeros so the numbers have the same length (see below for why that is OK)
3. Then add using column addition, remembering to put the decimal point in the answer.
• How can you subtract?

Method 5 Subtracting a Fraction from a Whole Number
1. Write down the problem.
2. Turn the whole number into a fraction with the same denominator as the fraction.
3. Rewrite the problem.
4. Subtract the numerators of the fractions while keeping the denominator the same.
• How do you subtract a percentage?

If your calculator does not have a percent key and you want to add a percentage to a number multiply that number by 1 plus the percentage fraction. For example 25000+9% = 25000 x 1.09 = 27250. To subtract 9 percent multiply the number by 1 minus the percentage fraction. Example: 25000 - 9% = 25000 x 0.91 = 22750.
B.

How can you compare fractions with the same denominator?

Step 1: Compare denominators. If they are different, rewrite one or both fractions with a common denominator. Step 2: Check the numerators. If the denominators are the same, then the fraction with the greater numerator is the greater fraction.
• When the only common factor of the numerator and denominator is 1?

A fraction in which the greatest common factor of the numerator and the denominator is 1 is known as a reduced, or simplified, fraction. Quite often I have also heard this called a fraction in its lowest terms. This just means that the fraction has been reduced.
• How do you know if a fraction is equivalent?

A simple way to look at how to check for equivalent fractions is to do what is called “cross-multiply”, which means multiple the numerator of one fraction by the denominator of the other fraction. Then do the same thing in reverse. Now compare the two answers to see if they are equal.
• How do you work out the equivalent fractions?

Summary:
1. You can make equivalent fractions by multiplying or dividing both top and bottom by the same amount.
2. You only multiply or divide, never add or subtract, to get an equivalent fraction.
3. Only divide when the top and bottom stay as whole numbers.
C.

How do you add fractions if the denominators are different?

If the denominators are not the same, then you have to use equivalent fractions which do have a common denominator . To do this, you need to find the least common multiple (LCM) of the two denominators. To add fractions with unlike denominators, rename the fractions with a common denominator. Then add and simplify.
• How do you divide fractions with other fractions?

In order, the steps are:
1. Leave the first fraction in the equation alone.
2. Turn the division sign into a multiplication sign.
3. Flip the second fraction over (find its reciprocal).
4. Multiply the numerators (top numbers) of the two fractions together.
5. Multiply the denominators (bottom numbers) of the two fractions together.
• How do we multiply and divide fractions?

Method 1 Multiplying Fractions
1. Multiply the numerators of the fractions. The numerator is the number on the top of a fraction and the denominator is the number on the bottom.
2. Multiply the denominators of the fractions. Now, you'll just have to do the same thing with the denominators.
3. Simplify the fraction.
• How do you divide by a fraction?

A simple way to divide by a fraction is to turn the fraction upside down and multiply. It works with all fractions. For example dividing by 2/3 is the same as multiplying by 3/2. Notice that when you divide by a fraction the answer is larger than the number you started with.

Updated: 20th October 2018