2001 - WAEC Mathematics Past Questions and Answers - page 1
1
Which of the following correctly expresses 48 as a product of prime factors?
A
3 x 4 x 4
B
2 x 3 x 8
C
2 x 2 x 2 x 3 x 4
D
2 x 2 x 2 x 2 x 3
2
Evaluate \((20_{three})^2 - (11_{three})^2\) in base three
A
101
B
121
C
202
D
2020
4
In a class of 80 students, every students studies Economics or Geography or both. If 65 students study Economics and 50 study Geography, how many study both subjects?
A
15
B
30
C
35
D
45
5
If N varies directly as M and N = 8 when M = 20 find M when N = 7
A
13
B
15
C
\(17\frac{1}{2}\)
D
\(18\frac{1}{2}\)
6
Express 0.0462 in standard form
A
0.460 x 10-1
B
0.462 x 10-2
C
4.62 x 10-1
D
4.62 x 10-2
7
In a bag of oranges, the ratio of the good ones to the bad ones is 5:4. If the number of bad oranges in the bag is 36, how many oranges are there in the altogether?
A
81
B
72
C
54
D
45
8
A boy estimated his transport fare for a journey as N190 instead of N200. Find the percentage error in his estimate
A
95%
B
47.5%
C
5.26%
D
5%
9
Evaluate \(5\frac{2}{5}\times \left(\frac{2}{3}\right)^2\div\left(1\frac{1}{2}\right)^{-1}\)
A
\(\frac{8}{25}\)
B
\(\frac{12}{25}\)
C
\(3\frac{3}{5}\)
D
\(4\frac{1}{8}\)
10
The nth term of a sequence is \(2^{2n-1}\). Which term of the sequence is \(2^9?\)
A
3rd
B
4th
C
5th
D
6th
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