List the outcomes and find the chance of one event

Answer Key - Grade 7 Math Worksheet - Challenge Me

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

1. 1.

   Luz's class has 30 seats numbered 1 to 30, and the line leader's seat is picked at random. What is the chance its number is a multiple of 4, as a fraction in simplest form?

   7/30
2. 2.

   Pia numbers 12 envelopes from 1 to 12 and picks one at random for the class mail helper. What is the chance its number is greater than 2, as a fraction in simplest form?

   5/6
3. 3.

   Ren spells ARIZONA with letter tiles and picks one without looking. What is the chance of a vowel (A, E, I, O or U), as a fraction in simplest form?

   4/7
4. 4.

   Jun's box holds 40 crayons, and the chance of picking a blue one without looking is 35%. How many blue crayons are in the box?

   14
5. 5.

   Luz's running club has 20 bibs numbered 1 to 20, and one runner is picked at random to lead warm-ups. What is the chance the bib number is greater than 3, as a percent?

   85
6. 6.

   The 25 lockers in Milo's hall are numbered 1 to 25, and one is picked at random for a new name sign. What is the chance its number is less than 7, as a percent?

   24
7. 7.

   Noah puts cards numbered 1 to 50 in a hat and draws one without looking (the hat is very full). What is the chance the number is a multiple of 6, as a percent?

   16
8. 8.

   Pia's class numbers 20 chairs from 1 to 20, and one is picked at random for the reading corner. What is the chance its number is greater than 9, as a decimal?

   0.55
9. 9.

   A shelf holds 25 books numbered 1 to 25, and Tala picks one at random for the weekend. What is the chance its number is greater than 4, as a decimal?

   0.84
10. 10.

    Noah puts cards numbered 1 to 10 in a hat and hopes to draw an even number. Noah draws one without looking. Which is the whole outcome list?

    • 1, 2, 3, 4, 5, 6, 7, 8, 9, 10
    • 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10
    • 1, 2, 3, 4, 5, 6, 7, 8, 9
    • 2, 4, 6, 8, 10