3rd Block Quizizz Adding & Subtracting Rationals

• 5/14
• 3/7
• 5/7
• 5/14

Is this a correct answer?

• Yes, the student correctly added.
• No, you cannot add unlike denominators
• No, 5 + 7 is not 12
• No, 2 + 3 is not 5

What is the first step in solving this problem? 
⅘ + ½ =

• Add the top parts of the fraction
• Rewrite the fractions in the simplest form. 
• Find a common denominator. 
• Make each fraction into an improper faction. 

⅘ + ½ =

• $\frac{5}{7}$

• $\frac{13}{10}$

• $\frac{13}{20}$

• $\frac{2}{3}$

What must you have to add and subtract fractions?

• Common numerators
• Different numerators
• Different denominators
• Common denominators

What is the LCM of 4 and 12?

• 4

• 8

• 12

• 16

What is the LCM of 4a and 12a²?

• 4a

• 8a

• 12a

• 12a²

What is the least common multiple of 20a²b² and 50b³?

• 100a²b³
• 10b³
• 10ab²
• 10b²

To find the L.C.M. of x² + x - 12 and x² - 9 you must first....

• factor the polynomials

• add the polynomials together

• subtract the polynomials

• multiply the polynomials

L.C.M. of x² + x - 12 and x² - 9 is

• (x + 3)(x + 4)
• (x - 3)(x + 4)
• (x - 3)(x + 3)(x + 4)
• x - 3