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 671: Find r, if 6r7₈ = 511₉ Options:
  A) 3
  B) 2
  C) 6
  D) 5
  Show Answer
  The correct answer is A .
• Question 672:

  Divide the L.C.M of 48, 64 and 80 by their H.C.F.

  Options:
  A) 20
  B) 30
  C) 48
  D) 60
  Show Answer
  The correct answer is D .
• Question 673:

  Measurements of the diameters, in centimeters, in centimeters, of 20 copper spheres are distributed as shown below:

  $\begin{array}{ccc}\text{Class boundary in cm}& \text{frequency}& \\ 3.35-3.45& 3\\ 3.45-3.55& 6\\ 3.55-3.65& 7\\ 3.65-3.75& 4\end{array}$

  What is the mean diameter of the copper spheres?

  Options:
  A) 3.40cm
  B) 3.58cm
  C) 3.56cm
  D) 3.62cm
  Show Answer
  The correct answer is C .
• Question 674: If 9^{(x - $\frac{1}{2}$)} 3x² Options:
  A) $\frac{1}{2}$
  B) 1
  C) 2
  D) 3
  Show Answer
  The correct answer is B .
• Question 675: Simplify $(\frac{16}{81}{)}^{\frac{1}{4}}÷(\frac{9}{16}{)}^{-\frac{1}{2}}$ Options:
  A) $\frac{2}{3}$
  B) $\frac{1}{2}$
  C) $\frac{8}{9}$
  D) $\frac{1}{3}$
  Show Answer
  The correct answer is B .
• Question 676: The ratio of the base area of a hollow cone to that of its curved surface is 1:4. If its base radius is 7cm, calculate the slant height of the cone Options:
  A) 7cm
  B) 22cm
  C) 28cm
  D) 49cm
  E) 154cm
  Show Answer
  The correct answer is C .
• Question 677:

  What is the n-th term of the sequence 2, 6, 12, 20...?

  Options:
  A) 4n - 2
  B) 2(3^{n - 1})
  C) n² + n
  D) n² + 3n + 2
  Show Answer
  The correct answer is C .
• Question 678: The mean and the range of the set of numbers: 1.20, 1.00, 0.90, 1.40, 0.80, 0.80, 1.20 and 1.10 are p and respectively. What is the value of p ÷ q Options:
  A) 1.11
  B) 65
  C) 1.85
  D) 2.45
  E) 3.85
  Show Answer
  The correct answer is B .
• Question 679: Differentiate $\frac{6x^3-5x^2+1}{3x^2}$ with respect to x Options:
  A) $\frac{2+2}{3x^3}$
  B) 2 + $\frac{1}{6x}$
  C) 2 - $\frac{2}{3x^3}$
  D) $\frac{1}{5}$
  Show Answer
  The correct answer is C .
• Question 680: Find the coefficient of xy in the expansion of (x - 4y)(3x + 2y) Options:
  A) 14
  B) 12
  C) 10
  D) -10
  E) -12
  Show Answer
  The correct answer is D .