Subtraction of Dissimilar Fractions

When can we add or subtract fractions?

• We can add or subtract fractions if and only if their denominators are the same.

• We can only add or subtract fractions if and only if their numerators are the same.

• We can add or subtract fractions if and only if they are dissimilar.

• We can add or subtract fractions simply by adding or subtracting their numerators as well as adding or subtracting their denominators.

In the case that the given fractions are dissimilar, how shall we make them similar being the only way to proceed to addition or subtraction of fractions?

• Add the denominators together. Whatever is the sum, that will be the denominator for both fractions.

• Just choose either of the denominator from both fractions that you wanted as new denominator before you proceed to adding and subtracting the numerators.

• Simply find LCD and use such LCD as the new denominator for both fractions. Then find equivalent fractions for each given.

• All of the above.

What is the LCD of the given fraction: 11/12 and 7/8?

• 16

• 36

• 21

• 24

Subtract 8/15 from 12/15. What is the difference?

• 1 1/3

• 20/15

• 4/15

• 1/3

What is the difference of 5/6 and 1/2?

• 1/2

• 2/3

• 1/6

• 1/3

Find LCD of 4/9 and 2/3.

• 9

• 3

• 18

• 27

Solve 2/3 - 4/9.

• 1/2

• 2/9

• 2/3

• 1 1/9

Find LCD of 9/10 and 3/4.

• 20

• 40

• 30

• 10

Alex bought 9/10 kg of mangoes while Basti bought 3/4 kg of mangoes. How much more kg of fruits did Alex bought that Basti?

• 1/3 kg

• 1/20 kg

• 2/3 kg

• 3/20 kg

Which of the following situations below make use of subtraction of fractions?

• Computing for leftover pieces of pizza during a Pizza Party.

• Finding the difference between the amount of kg of meat bought.

• When we take away a fractional portion from a certain whole.

• All of the above.