Subtracting Fractions and LCM

This video tutorial covers the process of subtracting fractions, starting with like denominators and moving to unlike denominators. It explains the importance of having a common denominator and demonstrates how to find the least common denominator (LCD). The tutorial includes visual models and several examples to illustrate the subtraction process, emphasizing simplification of fractions where possible.

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

• Add the numerators

• Multiply the denominators

• Subtract the numerators

• Find the least common denominator

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

• Difference of the denominators

• Greatest common factor

• Least common multiple

• Sum of the numerators

In the example of 3/4 minus 1/2, what is the least common denominator?

• 2

• 4

• 6

• 8

How do you simplify the fraction 3/12?

• 1/3

• 1/6

• 1/2

• 1/4

What is the least common multiple of 10 and 8?

• 50

• 20

• 30

• 40

In the example of 7/10 minus 3/8, what is the result after finding a common denominator?

• 21/40 - 18/40

• 35/40 - 24/40

• 30/40 - 20/40

• 28/40 - 15/40

What is the least common multiple of 12 and 15?

• 60

• 75

• 30

• 45

How do you simplify the fraction 21/60?

• 7/20

• 3/10

• 5/12

• 1/3

When subtracting 2 from 5/14, what is the least common denominator?

• 14

• 7

• 28

• 1

What is the result of 2 - 5/14 after converting 2 to a fraction?

• 19/14

• 14/14

• 23/14

• 28/14