Two-step chance: lists, tables and trees

Answer Key - Grade 7 Math Worksheet

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

1. 1.

   Esme rolls a fair number cube and flips a fair coin. What is the chance of a number 4 or greater and heads, in simplest form?

   1/4
2. 2.

   Jun spins a spinner with 3 equal parts (red, blue, yellow) and draws a card from 1 to 5 without looking. What is the chance of blue and an odd card, in simplest form?

   1/5
3. 3.

   Kira draws one of 5 cards numbered 1 to 5 without looking and flips a fair coin. What is the chance of an odd card and tails, in simplest form?

   3/10
4. 4.

   Luz flips a fair coin and spins a spinner with 4 equal parts numbered 1 to 4. What is the chance of heads and a 4, as a percent?

   12.5
5. 5.

   Noah draws one of 5 cards numbered 1 to 5 without looking and flips a fair coin. What is the chance of a card showing 1 or 5, and heads, as a percent?

   20
6. 6.

   Ren rolls two fair number cubes. What is the chance that the sum is 3, in simplest form?

   1/18
7. 7.

   Tala rolls two fair number cubes. What is the chance that the sum is 9, in simplest form?

   1/9
8. 8.

   Zee rolls two fair number cubes. What is the chance that the sum is 6, in simplest form?

   5/36
9. 9.

   Ari flips two fair coins. What is the chance of exactly one head, in simplest form?

   1/2

10. Read this first

    Tree

    The spinner splits into 1, 2 and 3; each of those splits into H and T. Leaves: 1-H, 1-T, 2-H, 2-T, 3-H, 3-T.

11. 10.

    Noah spins a spinner with 3 equal parts numbered 1 to 3, then flips a fair coin, as the tree shows. What is the chance of an odd number and tails, in simplest form?

    1/3