Sets: members, "and", "or", "not", and set-builder and interval notation

Answer Key - Grade 9 Math Worksheet

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

1. 1.

   Bo writes A = ｛1, 4, 6, 9, 12｝ and B = ｛4, 5, 9, 10, 12｝ in a math notebook. Which numbers are in A and in B, written with commas?

   4, 9, 12
2. 2.

   Jun writes A = ｛2, 4, 7, 9, 10｝ and B = ｛1, 4, 6, 9, 10, 12｝ on paper. Which numbers are in A and in B, written with commas?

   4, 9, 10
3. 3.

   Kira writes A = ｛1, 3, 6, 9｝ and B = ｛3, 4, 6, 10｝ in a math notebook. Which numbers are in A or in B (or in both), written with commas?

   1, 3, 4, 6, 9, 10
4. 4.

   Luz writes A = ｛2, 5, 8, 11｝ and B = ｛5, 7, 8, 12｝ on paper. Which numbers are in A or in B (or in both), written with commas?

   2, 5, 7, 8, 11, 12
5. 5.

   Milo writes A = ｛1, 4, 7, 10｝ and B = ｛2, 4, 7, 11｝ with a pencil. Which numbers are in A or in B (or in both), written with commas?

   1, 2, 4, 7, 10, 11
6. 6.

   Noah writes A = ｛3, 6, 9, 12｝ and B = ｛1, 6, 9, 10｝ in a math notebook. Which numbers are in A or in B (or in both), written with commas?

   1, 3, 6, 9, 10, 12
7. 7.

   Pia uses the whole numbers from 1 to 10 as set U on paper. Set A = ｛2, 4, 5, 9｝. Which numbers in U are not in A, written with commas?

   1, 3, 6, 7, 8, 10
8. 8.

   Ren uses the whole numbers from 3 to 12 as set U with a pencil. Set A = ｛4, 7, 8, 11｝. Which numbers in U are not in A, written with commas?

   3, 5, 6, 9, 10, 12
9. 9.

   Zee draws a graph on paper. Which set matches the graph?

   • ｛x | x < 1｝
   • ｛x | x > 1｝
   • ｛x | x ≥ 1｝
   • ｛x | x ≤ 1｝
10. 10.

    Esme draws a graph on paper. Which set matches the graph?

    • ｛x | x > -4｝
    • ｛x | x ≤ -4｝
    • ｛x | x < -4｝
    • ｛x | x ≥ -4｝