Mathematics Exam Past Questions and Answers | JAMB, WAEC and NECO

Mathematics looks at measurement, relationships, and properties of numbers and groups using numbers and symbols. Important topics in math include arithmetic, algebra, geometry, and calculus.

• Question 721: What is the mean deviation of x, 2x, x+1 and 3x. If their mean is 2? Options:
  A) 0.5
  B) 1.0
  C) 1.5
  D) 2.0
  Show Answer
  The correct answer is A .
• Question 722: If y = 3 sin(-4x), dy/dx is Options:
  A) 12x cos (4x)
  B) -12x cos (-4x)
  C) -12 cos (-4x)
  D) 12 sin (-4x)
  Show Answer
  The correct answer is C .
• Question 723: A sector of angle 120° is cut out from a circle of radius 13.5cm. what area of the circle is remaining ? (π = $\frac{22}{7}$) Options:
  A) 14.1cm²
  B) 95.5cm²
  C) 190.9cm²
  D) 381.9cm²
  E) 763.7cm²
  Show Answer
  The correct answer is D .
• Question 724: Evaluate correct to 4 decimal places 827.51 x 0.015 Options:
  A) 8.8415
  B) 12.4127
  C) 124.1265
  D) 12.4120
  E) 114.1265
  Show Answer
  The correct answer is B .
• Question 725: If x is negative, what is the range of values of x within which $\frac{x+1}{3}$ > $\frac{1}{X+3}$
  Options:
  A) 3 < x < 4
  B) -4 < x < -3
  C) -2 < x < -1
  D) -3 < x < 0
  Show Answer
  The correct answer is B .
• Question 726:

  If the binary operation $\ast$ is defined by m $\ast$ n = mn + m + n for any real number m and n, find the identity of the elements under this operation

  Options:
  A) e = 1
  B) e = -1
  C) e = -2
  D) e = 0
  Show Answer
  The correct answer is D .
• Question 727:

  

  Find the area of the shaded portion of the semicircular figure.

  Options:
  A) $\frac{r^2}{4}(4\pi -3\sqrt{3})$
  B) $\frac{r^2}{4}(2\pi -3\sqrt{3})$
  C) $\frac{1}{2}{r}^2\pi$
  D) $\frac{1}{8}{r}^2\sqrt{3}$
  E) $\frac{r^2}{4}(4\pi -3\sqrt{3})$
  Show Answer
  The correct answer is B .
• Question 728: In a school, there are 35 students in Class 2A and 40 in class 2B. The mean score for class 2A in an English literature examination is 60.0 and that for 2B in the same paper is 52.5. Find to one place of decimals, the mean for the combined classes. Options:
  A) 1.5
  B) 56.0
  C) 56.2
  D) 56.3
  E) 56.5
  Show Answer
  The correct answer is B .
• Question 729:

  

  The pie chart above shows the monthly distribution of a man's salary on food items. If he spent ₦8,000 on rice, how much did he spent on yam?

  Options:
  A) ₦42,000
  B) ₦18,000
  C) ₦16,000
  D) ₦12,000
  Show Answer
  The correct answer is C .
• Question 730: Find the derivative of y = sin²(5x) with respect to x. Options:
  A) 10 sin 5x cos 5x
  B) 5 sin5x cos 5x
  C) 2 sin 5x cos 5x
  D) 15 sin 5x cos 5x
  Show Answer
  The correct answer is A .