Adding Fractions with Unlike Denominators

In this video, Mr. J teaches how to add fractions with unlike denominators. The process involves finding the least common multiple of the denominators to establish a common denominator. The fractions are then renamed with this common denominator, allowing them to be added together. The result is simplified to its simplest form. The video concludes with a quick review and a link to a more detailed explanation.

Why do we need a common denominator when adding fractions?

• To simplify the fractions

• To convert fractions into whole numbers

• To ensure the fractions have the same base for addition

• To make the fractions look similar

What is the least common multiple of 10 and 4?

• 4

• 40

• 10

• 20

How do you convert 7/10 to have a denominator of 20?

• Multiply both numerator and denominator by 4

• Multiply both numerator and denominator by 2

• Multiply both numerator and denominator by 3

• Multiply both numerator and denominator by 5

What is the result of adding 14/20 and 5/20?

• 19/20

• 9/20

• 1/20

• 20/20

Is 19/20 in its simplest form?

• Yes, it is already simplified

• No, it can be simplified further

• Yes, but it can be converted to a mixed number

• No, it should be converted to a decimal