Worksheets: probabilityIntroduction to combinatorics and probability · grades 7-8

A quiz in groups or a practice sheet on “Probability” - with an answer key, ready to print, free. You can combine it with other sections.

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Answer key · group A · for the teacher · sheet no. 204 517

Probability

1.12612 ;12

2.817817

3.1448 · 34 = 36 ;48 − 36 = 12 ;1248 ;1248 = 14

4.3010 : 1 = 10 ;10 · 4 = 40 ;40 − 10 = 30 ;1040 = 14

5.1326 ;13

Maths worksheets · phiboard.com

Answer key

Quiz

Probability

GroupAB

Name Date Score / 13

1.What is the probability?A 12-sided die with faces numbered 1 to 12 is rolled once. What is the probability that a two-digit number comes up?(2 pt)

2.What is the probability?A box holds 10 white balls and 6 black balls. One ball is drawn. What is the probability of drawing a white ball?(2 pt)

3.What is the probability?A box contains 36 balls: blue, yellow and red. The probability of drawing a red ball is 23. One ball is drawn. What is the probability that the ball drawn is not red?(3 pt)

4.A box contains 3 white balls and 25 black balls. One ball is drawn. How many white balls must be added to the box for the probability of drawing a white ball to be 16?(3 pt)

Maths worksheets · phiboard.com

Group B

Quiz

Probability

GroupAB

Name Date Score / 13

1.What is the probability?A 12-sided die with faces numbered 1 to 12 is rolled once. What is the probability that an even number comes up?(2 pt)

2.What is the probability?A box holds 9 white balls and 8 black balls. One ball is drawn. What is the probability of drawing a black ball?(2 pt)

3.What is the probability?A box contains 48 balls: green, yellow and blue. The probability of drawing a green ball is 34. One ball is drawn. What is the probability that the ball drawn is not green?(3 pt)

4.A box contains only white and black balls, including 10 white balls. One ball is drawn. The probability of drawing a white ball is 14. How many black balls are in the box?(3 pt)

Maths worksheets · phiboard.com

Group A

Sheet settings

Quiz6 questions2 groups1 topic

Sheet no.204 517The number is only shown here and on the answer key - never on the student sheet. The same number with the same topics gives the same sheet.

answer key at the endall groups

Quiz

Probability

GroupAB

Name Date Score / 13

1.What is the probability?A 12-sided die with faces numbered 1 to 12 is rolled once. What is the probability that an even number comes up?(2 pt)

2.What is the probability?A box holds 9 white balls and 8 black balls. One ball is drawn. What is the probability of drawing a black ball?(2 pt)

4.A box contains only white and black balls, including 10 white balls. One ball is drawn. The probability of drawing a white ball is 14. How many black balls are in the box?(3 pt)

5.What is the probability?A single die is rolled. What is the probability that a number less than 3 comes up?(2 pt)

6.What is the probability?A six-sided die is rolled once. What is the probability that a number greater than 0 comes up?(1 pt)

Maths worksheets · phiboard.compage 10 of 10

Answer key · group A · for the teacher · sheet no. 204 517

Probability

1.12612 ;12

2.817817

3.1448 · 34 = 36 ;48 − 36 = 12 ;1248 ;1248 = 14

4.3010 : 1 = 10 ;10 · 4 = 40 ;40 − 10 = 30 ;1040 = 14

5.1326 ;13

6.166 = 1

The method lists the solution steps - handy when going through the sheet with the class.

Maths worksheets · phiboard.comsheet no. 999 999 · answer key, page 10 of 10

Quiz

Probability

GroupAB

Name Date Score / 13

1.What is the probability?A 12-sided die with faces numbered 1 to 12 is rolled once. What is the probability that a two-digit number comes up?(2 pt)

2.What is the probability?A box holds 10 white balls and 6 black balls. One ball is drawn. What is the probability of drawing a white ball?(2 pt)

3.What is the probability?A box contains 36 balls: blue, yellow and red. The probability of drawing a red ball is 23. One ball is drawn. What is the probability that the ball drawn is not red?(3 pt)

4.A box contains 3 white balls and 25 black balls. One ball is drawn. How many white balls must be added to the box for the probability of drawing a white ball to be 16?(3 pt)

5.What is the probability?A single die is rolled. What is the probability that a multiple of 3 comes up?(2 pt)

6.What is the probability?A six-sided die is rolled once. What is the probability that a number less than 7 comes up?(1 pt)

Maths worksheets · phiboard.compage 10 of 10

Answer key · group B · for the teacher · sheet no. 204 517

Probability

1.14312 ;14

2.581016 ;58

3.1336 · 23 = 24 ;36 − 24 = 12 ;1236 ;1236 = 13

4.225 : 5 = 5 ;5 · 6 = 30 ;30 − 25 = 5 ;5 − 3 = 2

5.1326 ;13

6.166 = 1

The method lists the solution steps - handy when going through the sheet with the class.

Maths worksheets · phiboard.comsheet no. 999 999 · answer key, page 10 of 10

What goes on the sheet: probability

The generator draws questions from 6 question types in this topic. Every quiz group gets the same types in the same order, only with different numbers, and a practice sheet goes from easier to harder.

Certain, possible and impossible events
Probability with one die
Drawing a ball from a box
Probability with a polyhedral die
A ball that is not a given colour
How many balls are in the box?

What the section covers in the curriculum: counting objects by listing them, simple random experiments (a die, a polyhedral die, drawing a ball), probability of an event

Students can also practise online - the same question types, with step-by-step solutions: Exercises: probability →

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