KS2 Primary Maths Age 9-13 - Probability: - Explained

The video tutorial explains a problem involving 20 balls in a bag, with fractions representing red, yellow, and green balls. It calculates the number of green balls and discusses the probability of selecting a green or black ball. The tutorial emphasizes basic arithmetic and probability concepts.

If there are 20 balls in a bag and 1/4 of them are red, how many red balls are there?

• 6

• 3

• 4

• 5

What is the total number of yellow balls if 3/5 of the balls in the bag are yellow?

• 10

• 11

• 12

• 13

How many green balls are in the bag if there are 20 balls in total and 17 are either red or yellow?

• 5

• 2

• 3

• 4

What is the probability of picking a green ball from the bag?

• 1/5

• 1/4

• 3/20

• 3/17

What is the probability of selecting a black ball from the bag?

• 1/20

• 1/5

• 0

• 1/10