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WAEC WASSCE Mathematics 2018 past questions and answers

This 2018 WAEC WASSCE 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 2018 set with instant marking.

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Sample WAEC WASSCE Mathematics 2018 questions

1. What is 1101 (base 2) in base ten?
  1. 12
  2. 13
  3. 14
  4. 15

Answer: B. 13

The place values give 1x8 + 1x4 + 0x2 + 1x1 = 13.

2. In the universal set {1, 2, ..., 20}, A is the set of multiples of 3 and B is the set of multiples of 4; how many elements are in A union B?
  1. 8
  2. 9
  3. 11
  4. 10

Answer: D. 10

There are 6 multiples of 3 and 5 multiples of 4, with 12 counted in both, so the union has 6 + 5 - 1 = 10 elements.

3. Evaluate 3/4 divided by 5/8.
  1. 6/5
  2. 5/6
  3. 15/32
  4. 32/15

Answer: A. 6/5

Dividing by 5/8 is multiplying by 8/5, so (3/4)(8/5) = 6/5.

4. A radio costs N800 before a 15% discount, after which 5% sales tax is added to the discounted price; what is the final price?
  1. N680
  2. N700
  3. N714
  4. N720

Answer: C. N714

The discounted price is 800 x 0.85 = N680, and adding 5% tax gives 680 x 1.05 = N714.

5. A sum of N840 is divided in the ratio 3:4:5; how much does the largest share receive?
  1. N280
  2. N300
  3. N350
  4. N420

Answer: C. N350

There are 12 parts altogether, so the largest share is 5/12 x 840 = N350.

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