Understanding Subtraction of Signed Fractions

The video tutorial explains how to subtract fractions with different denominators. It covers two examples, starting with a simple case and then moving to a more complex one. The process involves finding the least common denominator, rewriting fractions, and using prime factorization. The tutorial emphasizes the importance of having a common denominator and demonstrates how to handle negative signs in fractions.

What is the first step when subtracting signed fractions?

• Convert to decimals

• Multiply the fractions

• Identify a common denominator

• Find a common numerator

How do you determine the least common denominator when both denominators are prime numbers?

• Divide the denominators

• Add the denominators

• Subtract the denominators

• Multiply the denominators

What is the least common denominator of 7 and 5?

• 25

• 35

• 12

• 30

Tags

CCSS.7.NS.A.1C

When rewriting fractions with a common denominator, where is it easier to place the negative sign?

• In the denominator

• In the numerator

• In front of the fraction

• It doesn't matter

Tags

CCSS.7.NS.A.1C

What is the result of adding -25/35 and 7/35?

• 18/35

• -32/35

• -18/35

• 32/35

What is the least common multiple of 18 and 12?

• 48

• 60

• 36

• 24

What is the prime factorization of 18?

• 3 * 3 * 3

• 2 * 2 * 2

• 2 * 2 * 3

• 2 * 3 * 3

Why is prime factorization useful in finding the least common denominator?

• It is not useful

• It reduces the fractions

• It helps identify common factors

• It simplifies the numerators

What is the least common denominator of fractions with denominators 18 and 12?

• 42

• 30

• 36

• 24

Tags

CCSS.7.NS.A.1C

What is the result of adding -2/36 and -15/36?

• -13/36

• -17/36

• 17/36

• 13/36

Tags

CCSS.7.NS.A.1C