List the outcomes and find the chance of one event

Answer Key - Grade 7 Math Worksheet

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

1. 1.

   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?

   5/12
2. 2.

   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?

   4/11
3. 3.

   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?

   0.625
4. 4.

   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?

   0.8
5. 5.

   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?

   0.35
6. 6.

   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?

   0.36
7. 7.

   Noah's spinner has 10 equal parts: 7 stars and 3 hearts. What is the chance of landing on a star, as a percent?

   70
8. 8.

   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?

   12
9. 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. 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