Subtracting Fractions and Equivalent Fractions

In this video, Professor Demóclis Rocha explains how to subtract fractions with different denominators. He demonstrates the process by finding the least common multiple (LCM) of the denominators, converting the fractions to have a common denominator, and then performing the subtraction. The example used is 4/5 minus 3/4, which results in 1/20. The video concludes with a summary of the steps and the importance of understanding equivalent fractions.

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

• Add the numerators directly

• Find the least common multiple of the denominators

• Multiply the fractions

• Subtract the denominators

What are the multiples of 5 listed in the video?

• 5, 10, 15, 20, 25

• 4, 8, 12, 16, 20

• 6, 12, 18, 24, 30

• 3, 6, 9, 12, 15

What is the least common multiple of 5 and 4?

• 25

• 20

• 15

• 10

How do you determine the new numerator for the fraction 4/5?

• Multiply the numerator by 5

• Subtract 4 from the numerator

• Multiply the numerator by 4

• Add 5 to the numerator

What is the equivalent fraction of 4/5 with a denominator of 20?

• 20/20

• 12/20

• 8/20

• 16/20

What is the equivalent fraction of 3/4 with a denominator of 20?

• 12/20

• 21/20

• 15/20

• 18/20

What operation is performed on the numerators when subtracting fractions with the same denominator?

• Divide the numerators

• Multiply the numerators

• Add the numerators

• Subtract the numerators

What is the result of subtracting 16/20 and 15/20?

• 1/20

• 2/20

• 4/20

• 3/20

What type of fraction is 1/20?

• Proper fraction

• Mixed number

• Improper fraction

• Complex fraction

Why is 1/20 considered irreducible?

• It is a mixed number

• It can be simplified further

• The numerator and denominator have no common factors other than 1

• The numerator is larger than the denominator