Adding and Subtracting Fractions

In this video, Marissa's Math Club covers the topic of adding fractions with different denominators. The video begins with an introduction to the importance of finding a common denominator when adding or subtracting fractions. It then provides a step-by-step guide on how to find common denominators using an example problem. The example involves adding fractions with denominators of 12 and 18, demonstrating how to find common multiples and adjust numerators accordingly. The video concludes with the final solution and a brief mention of the next topic, subtracting fractions with different denominators.

Why is it important to find a common denominator when adding fractions?

• To ensure the fractions have the same base for addition

• To simplify the fractions

• To convert fractions to decimals

• To make the numerators equal

What is the first step in adding fractions with different denominators?

• Find a common denominator

• Add the numerators directly

• Multiply the fractions

• Convert fractions to percentages

How do you find the common denominator for 5/12 and 9/18?

• By adding the denominators

• By finding the least common multiple of the denominators

• By subtracting the denominators

• By dividing the larger denominator by the smaller one

What is the least common multiple of 12 and 18?

• 24

• 30

• 36

• 48

Once a common denominator is found, what is the next step?

• Add the denominators

• Subtract the numerators

• Convert the original fractions to equivalent fractions with the common denominator

• Multiply the fractions

How do you convert 5/12 to an equivalent fraction with a denominator of 36?

• Multiply both numerator and denominator by 2

• Add 24 to the numerator

• Subtract 7 from the denominator

• Multiply both numerator and denominator by 3

What is the equivalent fraction of 9/18 with a denominator of 36?

• 36/36

• 27/36

• 9/36

• 18/36

When adding fractions with a common denominator, what happens to the denominator?

• It is multiplied by the numerators

• It remains the same

• It is added together

• It is subtracted

What is the sum of 15/36 and 18/36?

• 27/36

• 36/36

• 30/36

• 33/36

What is the final step in adding fractions with different denominators?

• Add the numerators and keep the common denominator

• Multiply the fractions

• Convert the fractions to decimals

• Subtract the numerators