Subtracting Fractions and Common Denominators

This video tutorial covers the process of subtracting signed fractions. It begins with an introduction to the concept, followed by a detailed explanation of finding the least common denominator (LCD) when denominators are not the same. The tutorial includes several example problems to illustrate the process of subtracting fractions, including handling negative fractions and simplifying the results. The video concludes with more advanced examples, emphasizing the importance of finding the LCD and simplifying fractions.

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

• Find the least common multiple

• Keep the denominator the same and subtract the numerators

• Add the numerators

• Multiply the denominators

When subtracting fractions with different denominators, what must you find first?

• The sum of the numerators

• The least common denominator

• The greatest common factor

• The product of the denominators

How do you handle subtracting a negative fraction?

• Multiply it by zero

• Ignore the negative sign

• Add it as a positive fraction

• Subtract it as a positive fraction

What is the least common denominator of 5 and 15?

• 5

• 20

• 10

• 15

What is the simplified form of -9/15?

• -3/5

• -2/5

• -1/5

• -4/5

If you have fractions with denominators 10 and 8, what is their least common denominator?

• 30

• 40

• 20

• 18

What is the result of subtracting -3/10 from -1/8?

• -11/40

• -9/40

• -5/40

• -7/40

What is the least common denominator of 12 and 15?

• 75

• 60

• 45

• 30

How do you convert a whole number to a fraction for subtraction?

• Write it over 1

• Subtract 1 from it

• Multiply it by 1

• Divide it by 2

What is the result of subtracting 5/16 from -2?

• -37/16

• -32/16

• -27/16

• -22/16