# Practice Worksheet of Probability

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Basic Probability as Fractions, Decimals, and Percents. Practice worksheets with solutions for a better understanding of the concepts.
1. ® Name:
Date:
Basic Probability as Fractions BP 1
Instructions: Use this spinner to answer the following questions: 8 1
(Use fraction form to express the probabilities and simplify if 2
possible.)
7
6 3
5 4
1 What is the probability of 1 2 What is the probability of 2 or
1
spinning a 1? 8 spinning a 1 or a 2? 8 4
3 What is the probability of 1 4 What is the probability of 4 1
or
spinning a 6? 8 spinning a white sector?
8 2
What is the probability of 0 What is the probability of 4 1
5 or 0 6 or
spinning a 10? 8 spinning an even number? 8 2
7 What is the probability of 4 or
1 8 What is the probability of 3
spinning a grey sector? 8 2 spinning a number greater 8
than 5?
Instructions: Use this bag of 10 marbles to answer the following
questions: (Use fraction form to express the probabilities and simplify
if possible.)
If you randomly select a marble...
9 What is the probability that 3 10 What is the probability that 5 or 1
it will be black? 10 it will be grey? 10 2
What is the probability that 2 or 1 What is the probability that 0 or
11
it will be white?
12
it will be green? 0
10 5 10
13 What is the probability that 5 or 1 14 What is the probability that 8 or 4
it will be black or white? 10 2 it will be black or grey? 10 5
What is the probability that 7 What is the probability that 10 or
15 16 1
it will be white or grey? 10 it will not be green? 10
Basic Probability • mathantics.com © 2018 Math Plus Motion, LLC
2. ® Name:
Date:
Basic Probability as Fractions, Decimals and Percents BP 2
Instructions: Use this spinner to answer the following questions: 5 a
(You can use a calculator to get the decimal values if you need to.) 4 b
3 c
2 1
What is the probability of 5
1
spinning a number? 8 0.625 62.5%
fraction decimal percentage
What is the probability of
3
2
spinning a letter? 8 0.375 37.5%
fraction decimal percentage
What is the probability of 1
3
spinning a ‘b’? 8 0.125 12.5%
fraction decimal percentage
What is the probability of 2 or
1
4
spinning a grey sector? 8 4 0.25 25%
fraction decimal percentage
What is the probability of 6 or
3
5
spinning a white sector? 8 4 0.75 75%
fraction decimal percentage
What is the probability of spinning 4 or
1
6
a number less than 5? 8 2 0.5 50%
fraction decimal percentage
What is the probability of spinning a
8 or 1
7
number or a letter? 8 1.0 100%
fraction decimal percentage
What is the probability of 0
8
spinning a 6? 8 0.0 0%
fraction decimal percentage
9 What is the probability of spinning 7
a white sector or a 2? 8 0.875 87.5%
fraction decimal percentage
Basic Probability • mathantics.com © 2018 Math Plus Motion, LLC
3. ® Name:
Date:
Likely or Unlikely? Etc. BP 3
Instructions: For each question below, tell if the event described would be “impossible”, “unlikely”,
“as likely as not” (you can write “50-50”), “likely” or “certain”.
As likely as not
Impossible (50-50) Certain
0 1 1
Unlikely 2 Likely
1 What is the probability of flipping 2 If the weather report says there is a
“heads” in a fair coin toss? 100% chance of rain in the afternoon, it
means that rain is...
as likely as not (or 50-50) certain
3 A bag of marbles contains 10 red, 5 4 On a multiple choice question, if there
green and 7 blue marbles. How would are 5 possible answers, getting the
you describe the probability of randomly right answer by a completely random
choosing a yellow marble from the bag? guess would be...
impossible unlikely
5 If a music playlist contains 8 songs you 6 Rolling a 6 on a standard 6-sided die is
like and 2 you don’t, randomly playing a considered...
song that you like is...
likely unlikely
7 Rolling an even number on a standard 8 If the weather report says there is a
6-sided die would be... 20% chance of snow, that would be
considered...
as likely as not (or 50-50) unlikely
9 If a bag of marbles contains 10 blue, 10 If an assorted box of chocolates contains
4 yellow and 4 red marbles, randomly 20 different kinds, and you like all of them,
choosing a blue marble would be... what is the probability that you will
randomly select one that you like?
likely certain
Basic Probability • mathantics.com © 2018 Math Plus Motion, LLC
4. ® Name:
Date:
The Probability Line BP 4
Instructions: Answer the following probability questions using both fraction and decimal form.
(You can use a calculator to get the decimal form if you need to.) Then plot the probabilities on
the Probability Line.
1 A spinner has 5 equally sized sectors 2 What is the probability of rolling an
numbered 1 thru 5. What is the prob- even number on a standard 6-sided
ability of spinning a 2? die?
1 3 or
1
5 0.2 6 2 0.5
fraction decimal fraction decimal
0 1 1 0 1 1
2 2
3 A bag contains 20 marbles. 5 are blue 4 A spinner has 10 equally sized sectors
and the rest are red. What is the prob- numbered 1 thru 10. What is the prob-
ability of randomly choosing a red ability of spinning a number that’s
marble? greater than 1?
15 or
3 9
20 4 0.75 10 0.9
fraction decimal fraction decimal
0 1 1 0 1 1
2 2
5 A box of popsicles contains 3 cherry, 6 A box of 12 chocolates has 3 pieces
3 grape and 4 orange. What is the that contain nuts. If you choose at
probability of randomly choosing random, what is the is probability of
orange? getting a piece with nuts?
4 3 1
or
10 0.4 12 4 0.25
fraction decimal fraction decimal
0 1 1 0 1 1
2 2
Basic Probability • mathantics.com © 2018 Math Plus Motion, LLC