LCD Sum and Difference of Fractions

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 least common denominator of 1/2 and 3/7?

• 2

• 14

• 7

• 28

7/8 - 7/12

• 7/24

• 1/4

• 7/12

• 4/24

What is the last step in adding or subtracting fractions?

• Find their LCD

• Add or subtract the whole number

• Copy the denominator

• Simplify

• 1 4/15

• 2 5/15

• 1 5/15

• 2 4/15

Find the difference:

7/9 - 2/5

• 17/45

• 5/4

• 5/9

• 5/45

Add 6/14 and 1/2

• 7/16

• 13/14

• 7/14

• 3/4

Which shows a way to solve 3/7 + 2/5

• _{Add the numerators first, then add the denominators.}

• Find the LCD for 7 and 5, then make equivalent fractions and then subtract

• Find the LCD for 7 and 5, then make equivalent fractions and then add

• Find the LCD for 7 and 5, then multiply both numerators by 5.

What is the first step in finding the Least common Denominator for two fractions?

• List all of the multiples of each numerator

• Multiply the numerators together

• Add the denominators

• List the first few multiples of each denominator

What is the sum of 3/4 and 2/6?

• 13/12

• 6/8

• 8/24

• 8/12