Finding Common Denominators When Subtracting Fractions

The video tutorial explains how to subtract fractions and mixed numbers with unlike denominators. It begins by finding a common denominator, then moves on to creating equivalent fractions. The tutorial demonstrates the subtraction process for both fractions and mixed numbers, emphasizing the importance of writing fractions vertically for clarity. It concludes with tips for achieving high scores in math by showing work and ensuring complete answers.

What is the first step when subtracting fractions with different denominators?

• Divide the fractions

• Multiply the fractions

• Find a common denominator

• Add the numerators directly

What is the least common multiple of 7 and 6?

• 42

• 48

• 12

• 36

How do you find the equivalent fraction for 6/7 when the common denominator is 42?

• Multiply the numerator by 6 and denominator by 7

• Multiply both numerator and denominator by 7

• Multiply the numerator by 7 and denominator by 6

• Multiply both numerator and denominator by 6

When subtracting mixed numbers, what should you do after finding equivalent fractions?

• Multiply the fractions

• Subtract the fractions first

• Add the fractions

• Subtract the whole numbers first

What is the least common multiple of 8 and 6?

• 18

• 24

• 30

• 36

What is the result of subtracting 12 7/8 from 8 2/6?

• 5 and 13/24

• 4 and 11/24

• 5 and 11/24

• 4 and 13/24

Why is it important to show your work when subtracting fractions?

• To impress the teacher

• To avoid using a calculator

• To ensure accuracy and completeness

• To make the process faster