Grade 7 · Math

7th grade List the outcomes and find the chance of one event worksheet

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Level: Building Confidence · On Level · Challenge Me

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List the outcomes and find the chance of one event

Grade 7 Math Worksheet

NameDate

Circle the best answer, or write your answer on the line.

Pia's button jar has 6 red, 10 blue and 8 yellow buttons. Pia picks one without looking. What is the chance it is blue, as a fraction in simplest form?
M, I, S, S, I, S, S, I, P, P, I (11 tiles). Zee spells MISSISSIPPI with letter tiles (that is a lot of tiles) and mixes them in a box. What is the chance of picking an S without looking, as a fraction in simplest form?
Ari has 8 picture cards: 5 dogs, 1 cat, 1 frog and 1 duck. Ari turns one over without looking. What is the chance it shows a dog, as a decimal?
Bo's pencil case holds 4 pencils and 1 pen (the zipper squeaks). Bo grabs one without looking. What is the chance it is a pencil, as a decimal?
A jar holds 7 green, 6 white, 4 black and 3 red buttons. Esme picks one without looking. What is the chance it is green, as a decimal?
Jun has 25 picture cards: 9 frogs and 16 ducks (the pond team). Jun turns one over without looking. What is the chance it shows a frog, as a decimal?
Noah's spinner has 10 equal parts: 7 stars and 3 hearts. What is the chance of landing on a star, as a percent?
Pia's box of 25 crayons has 3 purple and 22 yellow ones (a very sunny box). What is the chance of picking purple without looking, as a percent?
9.
Jun's spinner has 6 equal parts: 3 stars, 2 moons and 1 sun. Which is the whole outcome list?
- star, star, moon, moon, sun, leaving a star out
- star, star, star, moon, moon
- star, moon, sun
- star, star, star, moon, moon, sun
10.
Luz spells PEPPER with letter tiles (a spicy word) and picks one without looking. Which is the whole outcome list?
- P, P, P, E, E, R
- P, P, E, E, R
- P, E, R

7th grade List the outcomes and find the chance of one event worksheet – printable — Print: 1 2 3 4 5 6

About this worksheet

List the outcomes and find the chance of one event. Every version has 10 questions, and the answer key prints on the second page.

What your child will learn

I can list every equally likely outcome as a row, and know that each one has the same chance.
I can find a chance as rows that count ÷ all rows, and write it as a fraction in simplest form, a decimal or a percent.
I can work back from a chance to a count: a 3/10 chance in a jar of 20 means 6 buttons.

Standard: 7.SP.C.7a

Words to know

outcome: One thing that can happen, like landing on one part of a spinner.

outcome list (sample space): Every possible outcome, one row each. Schools call it the sample space.

equally likely: Every outcome has the same chance, like the faces of a fair number cube.

event: The outcomes the question asks about, like "a star" or "a number above 9".

chance (probability): Outcomes that count ÷ all outcomes. A number from 0 to 1.

uniform model: Every outcome gets the same chance: 1 ÷ the number of rows.

Common mistakes

Your child compared the outcomes that count with the ones that don't (3 to 5) instead of with all of them (3 out of 8).

Your child found the chance of the other outcomes, the ones the question did not ask about.

Your child gave each color or picture one outcome, but there are more of some than of others.

What to say

Ask: out of how many outcomes in all?

Ask: which outcomes does the question want?

Ask: how many of each are there?

Questions parents ask

What is the most common mistake with list the outcomes and find the chance of one event?

Your child compared the outcomes that count with the ones that don't (3 to 5) instead of with all of them (3 out of 8).

How can I help my child with list the outcomes and find the chance of one event?

Ask: out of how many outcomes in all?

Are these 7th grade math worksheets free to print?

Yes. All 6 printable versions at each level are free to print, with the answer key, and no account is needed.

More grade 7 math

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