Subtracting Fractions with Different Denominators

This video tutorial explains how to subtract fractions with different denominators by finding a common denominator. It provides three examples: 5/6 - 2/9, 7/8 - 3/4, and 4/5 - 2/3, demonstrating the process of finding the lowest common multiple and adjusting numerators accordingly. The tutorial concludes with an interactive exercise encouraging students to identify mistakes in fraction subtraction.

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

• Add the numerators directly

• Find a common denominator

• Multiply the denominators

• Divide the fractions

In the example of 5/6 minus 2/9, what is the common denominator used?

• 9

• 12

• 24

• 18

When subtracting 7/8 and 3/4, what is the lowest common multiple of the denominators?

• 12

• 16

• 8

• 4

In the example of 4/5 minus 2/3, what is the result after finding a common denominator and subtracting?

• 4/15

• 1/15

• 2/15

• 3/15

What should you do if you find a mistake in subtracting fractions?

• Ignore it

• Recalculate using the correct method

• Add the fractions instead

• Change the numerators randomly