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NECO SSCE Mathematics 2009 past questions and answers

This 2009 NECO SSCE Mathematics set has 40 practice questions. Try these 5 free sample questions, tap a question to reveal the answer and explanation. Then practise the whole 2009 set with instant marking.

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Sample NECO SSCE Mathematics 2009 questions

1. The mean of 6, 8, 9, 12 and x is 9. Find x.
  1. 9
  2. 10
  3. 11
  4. 12

Answer: B. 10

The five numbers must sum to 45, and 45 - (6 + 8 + 9 + 12) = 10.

2. Two fair six-sided dice are thrown. What is the probability that their scores sum to 9?
  1. 1/6
  2. 1/12
  3. 1/9
  4. 5/36

Answer: C. 1/9

There are 4 outcomes summing to 9 among 36 equally likely outcomes, so the probability is 4/36 = 1/9.

3. What is the size of each interior angle of a regular decagon?
  1. 144 degrees
  2. 135 degrees
  3. 150 degrees
  4. 120 degrees

Answer: A. 144 degrees

Each interior angle is (10 - 2) x 180/10 = 144 degrees.

4. A right-angled triangle has perpendicular sides of lengths 9 cm and 12 cm. Find the hypotenuse.
  1. 13 cm
  2. 14 cm
  3. 16 cm
  4. 15 cm

Answer: D. 15 cm

The hypotenuse is sqrt(9^2 + 12^2) = sqrt(225) = 15 cm.

5. Find the gradient of the line joining (2, 3) and (6, 11).
  1. 2
  2. 1/2
  3. 4
  4. 8

Answer: A. 2

The gradient is (11 - 3)/(6 - 2) = 2.

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