Adding Fractions with Like Denominators

The video tutorial explains how to add fractions with like denominators. It demonstrates the process using two examples: two-sevenths plus three-sevenths and two-ninths plus one-ninth. The tutorial emphasizes keeping the denominator the same and adding the numerators. It also shows how to use visual models to understand why the denominator remains unchanged and how to simplify fractions when possible. The first example results in five-sevenths, which cannot be simplified, while the second example simplifies from three-ninths to one-third.

What is the first step when adding fractions with the same denominator?

• Subtract the numerators

• Add the denominators

• Multiply the denominators

• Keep the denominator the same

In the example of two-sevenths plus three-sevenths, what is the sum?

• Five-fifths

• Five-ninths

• Five-sevenths

• Five-fourteenths

Why does the denominator remain unchanged when adding fractions with like denominators?

• Because the pieces are of the same size

• Because the pieces are of different sizes

• Because the numerators are added

• Because the fractions are improper

What should you check after finding the sum of fractions?

• If the numerators are equal

• If the fraction can be simplified

• If the sum is greater than one

• If the sum is a whole number

What is the simplified form of three-ninths?

• One-third

• Three-thirds

• One-ninth

• Three-sixths

In the example of two-ninths plus one-ninth, what common factor is used to simplify the fraction?

• One

• Nine

• Three

• Two

How many pieces are there in the model for three-ninths?

• Three

• Four

• Two

• Five

What does each piece represent in the model for two-ninths plus one-ninth?

• One-third

• One-ninth

• One-seventh

• One-fifth

What is the final simplified result of two-ninths plus one-ninth?

• Three-thirds

• One-third

• One-half

• Two-thirds