Finding Missing Probabilities and Fractions

The video tutorial covers a math problem from section 1.2.8 of CC2 7th grade math, focusing on finding a missing fraction in a spinner game. The teacher explains the problem, discusses the probabilities of different sections of the spinner, and demonstrates two methods to calculate the missing fraction: adding up known probabilities and subtracting from one, and using a shortcut by identifying half of the spinner. The tutorial also covers finding a common denominator to subtract fractions, ultimately determining the missing fraction as 1/10.

What is the main problem discussed in the video?

• Calculating the area of a circle

• Finding the missing probability on a spinner

• Understanding geometric shapes

• Solving a linear equation

What is the probability of landing in the first section of the spinner?

• 1/5

• 1/4

• 1/3

• 1/2

What is the probability of landing in the second section of the spinner?

• 1/6

• 1/4

• 1/3

• 1/5

What is the probability of landing in the third section of the spinner?

• 2/5

• 2/3

• 2/6

• 2/4

What is the total probability of all sections on the spinner?

• 4

• 2

• 3

• 1

How do you find the missing probability using the first method?

• Divide all probabilities

• Multiply all probabilities

• Subtract all probabilities

• Add all probabilities and subtract from 1

What is the shortcut method to find the missing probability?

• Divide by 2

• Add 1/3 and 1/6

• Subtract 2/5 from 1/2

• Multiply by 2

What is the least common multiple used in the detailed calculation?

• 12

• 10

• 6

• 5

What is the missing probability on the spinner?

• 1/3

• 1/10

• 1/6

• 1/5

What is the first step in finding a common denominator?

• Subtract the fractions

• Multiply by the giant one

• Add the fractions

• Divide the fractions