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Maths Quiz for Class 8 Rational Numbers |
In this post, we are providing 20 online maths quiz
questions for class 8 rational numbers. Online maths quiz will take around 20
minutes to complete it.
Question 1: The standard form of the rational number 24/36 is _________.
A) 12/18
B) 6/9
C) 2/3
D) 1/3
Explanation: 24/36 = (24 ÷ 12)/(36 ÷ 12) = 2/3 (Since HCF of 24 and 36 is 12.)
Question 2: The standard form of the rational number 15/-45 is _________.
A) -1/3
B) 1/-3
C) -3/9
D) -5/15
Explanation: 15/-45 = (15 ÷ 15)/(-45 ÷ 15) = 1/-3 = -1/3 (In standard form, minus sign (-) is always taken in numerator.)
Question 3: The additive identity of the rational number -1/2 is _________.
A) 0
B) 1
C) ½
D) -1/2
Explanation: The additive identity of any rational number is 0.
Question 4: The multiplicative identity of 3/5 is ___________.
A) 0
B) 1
C) -3/5
D) 3/5
Explanation: The multiplicative identity of any rational number is 1.
Question 5: The additive inverse of 4/9 is ___________.
A) 4/9
B) -4/9
C) 1
D) 0
Explanation: The additive inverse of 4/9 is -4/9.
Question 6: The multiplicative inverse of -5/7 is _____________.
A) 0
B) 1
C) -7/5
D) 5/7
Explanation: The multiplicative inverse of -5/7 is -7/5.
Question 7: -2/5 + 3/10 = __________
A) 1/10
B) -1/10
C) 1/5
D) 5/15
Explanation: -2/5 + 3/10 = -4/10 + 3/10 = -1/10
Question 8: 5/6 – 7/12 = ___________
A) -1/4
B) ½
C) 1/3
D) ¼
Explanation: 5/6 – 7/12 = 10/12 – 7/12 = 3/12 = ¼
Question 9: 2/9 + (-2/3) = __________
A) -4/9
B) 4/9
C) -2/9
D) 2/9
Explanation: 2/9 + (-2/3) = 2/9 – 6/9 = -4/9
Question 10: (-5/12) + (-5/8) = ________
A) 25/24
B) -23/24
C) -25/24
D) -13/12
Explanation: (-5/12) + (-5/8) = -10/24 – 15/24 = -25/24
Question 11: (3/4) – (-5/6) = _________
A) 1/12
B) 19/12
C) -1/12
D) -2/12
Explanation: (3/4) – (-5/6) = 9/12 + 10/12 = 19/12
Question 12: (-2/5) – 11/15 = __________
A) 17/15
B) -17/15
C) -9/15
D) -13/15
Explanation: (-2/5) – 11/15 = -2/5 – 11/15 = -6/15 – 11/15 = -17/15
Question 13: (-6/11) × (22/18) = __________
A) -2/3
B) 2/3
C) 2/5
D) -2/5
Explanation: (-6/11) × (22/18) = -2/3
Question 14: (9/11) × (-2/7) = _______ × 9/11
A) -9/11
B) 9/11
C) 2/7
D) (-2/7)
Explanation: (9/11) × (-2/7) = (-2/7) × 9/11
Question 15: (-8/25) ÷ (-4/5) = ___________
A) 5/2
B) -5/2
C) 2/5
D) -2/5
Explanation: (-8/25) ÷ (-4/5) = (-8/25) × (-5/4) = 2/5
Question 16: 4/9 × (-2/7 + 1/4) = (4/9 × -2/7) + (_______ × ¼)
A) -4/9
B) 4/9
C) -2/7
D) ¼
Explanation: 4/9 × (-2/7 + 1/4) = (4/9 × -2/7) + (4/9 × ¼)
Question 17: Which rational number lies between -1/2 and -3/2?
A) -1
B) -5/2
C) ½
D) -2
Explanation: -1 lies between -1/2 and -3/2.
Question 18: Which of the following rational numbers is the greatest?
A) -5/3
B) -19/2
C) 0
D) -100/9
Explanation: 0 is greater than all negative rational numbers.
Question 19: Which of the following rational numbers is the smallest?
A) -1/3
B) -1/2
C) -1/4
D) -1/5
Explanation: -1/2 is the smallest among all the given rational numbers.
Question 20: The absolute value of -9/13 is __________.
A) 0
B) 1
C) 9/13
D) -9/13
Explanation: The absolute value of -9/13 is 9/13.
Report Card
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