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Mathematics

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Quizzes in Mathematics for Grade 8

A bag has 6 red, 3 blue, and 2 green marbles. What is the probability of choosing a red marble?

  • 11/6
  • 3/11
  • 6/11
  • 6/9
  • 2/11
Correct answer(s):
  • 6/11

Factorize: x² – 121.

  • x(x – 11)
  • (x – 11)(x – 11)
  • (x + 11)(x – 11)
  • (x + 11)(x + 11)
  • (x + 121)(x – 1)
Correct answer(s):
  • (x + 11)(x - 11)

A bag has 5 red, 8 blue, and 4 green marbles. What is the probability of choosing a red marble?

  • 17/5
  • 4/17
  • 8/17
  • 5/17
  • 5/13
Correct answer(s):
  • 5/17

A bag has 4 red, 6 blue, and 3 green marbles. What is the probability of choosing a red marble?

  • 3/13
  • 4/10
  • 6/13
  • 4/13
  • 13/4
Correct answer(s):
  • 4/13

Let A = {1, 2, 9, 13, 17} and B = {9, 10, 13, 15, 17}. What is A ∩ B?

  • {1, 2}
  • {1, 2, 9, 10, 13, 15, 17}
  • {9, 13, 17}
  • {}
Correct answer(s):
  • {9, 13, 17}

Add the matrices [[7, 5], [1, -3]] and [[5, 3], [5, 7]].

  • [[2, 2], [-4, -10]]
  • [[12, 8], [6, 4]]
  • [[12, 6], [8, 4]]
  • [[35, 15], [5, -21]]
Correct answer(s):
  • [[12, 8], [6, 4]]

Solve the system: 1x + 2y = 11 and 2x – 1y = -3.

  • x = 1, y = 5
  • x = 11, y = -3
  • x = -1, y = -5
  • x = 5, y = 1
  • x = 2, y = 4
Correct answer(s):
  • x = 1, y = 5