# Mathematics 2021 Past Questions | WAEC

Study the following Mathematics past questions and answers for JAMBWAEC  NECO and Post-JAMB. Get prepared with official past questions and answers for upcoming examinations.

1. Correct, 0.00798516 to three significant figures
• A. 0109
• B. 0800
• C. 00799
• D. 0.008

2.  Simplify (11two)2

• A. 1001two
• B. 1101two
• C. 101two
• D. 10001two

3.  Solve = 2$$^\sqrt{2x+1}$$ = 32

• A. 13
• B. 24
• C. 12
• D.11

4. If log102 =m and log103 =n, find log1024  In term of m and n.

• A. 3m+n
• B. m+3n
• C. 4mn
• D. 3mn

5. Find the 5th term of the sequence 5, 10, 17, …….

• A. 22
• B. 24
• C. 36
• D. 26

6. If P = {-3<x<1} and Q ={-1<x<3}, where x is a real number find, P n Q.

• A. {-1<x<1}
• B. {-3<x<1}
• C. {-1<x<1}
• D. {-1<x<1}

7.  Factorize 6pq-3rs-3ps + 6qr

• A. (3r-p) (2q + s)
• B. 3(p + r)(2q-s)
• C. 3(p – r)(2q-s)
• D. (3r-p)(s-2q)

8. What number should be subtracted from the sum of 2 1/6 and 2 7/12 to give 3 ¼.

• A. 1/3
• B. 1 1/2
• C. 1 1/6
• D. 1/2

9.  Mensah is 5 years old and Joyce is thrice as old as Mensah. In how many years will Joyce be twice as old as Mensah?

• A. 3 years
• B. 10 years
• C. 5 years
• D. 15 years

10.  If 16 x 2(x+1) = 4x x 8(1-x), find the value of x.

• A. -4
• B. 4
• C.
• D. -1

Study the following Physics past questions and answers for JAMBWAEC  NECO and Post-JAMB. Get prepared with official past questions and answers for upcoming examinations.

11. The circumference of a circular track is 9 km. A cyclist rides round it a number of times and stops after covering a distance of 302km. How far is the cyclist from the starting point?

• A. 5km
• B. 6km
• C. 7km
• D. 3km

12. Simplify 2$$\sqrt{7}$$ – $$\frac{14}{\sqrt{7}}$$ + $$\frac{7}{\sqrt{21}}$$

• A. $$\frac{\sqrt{21}}{21}$$
• B. 7$$\frac{\sqrt{21}}{3}$$
• C. $$\frac{\sqrt{21}}{3}$$
• D.2$$\sqrt{3}$$

13. If 4x +2y =16 and 6x – 2y = 4, find the value of (y-x)

• A. 8
• B. 2
• C. 4
• D. 6

14. Given that R is directly proportional to L and inversely proportional to P, R=3 when L =9 and P=0.8, find R when L=15 and P =1.8

• A. 2.2
• B. 3.3
• C. 6.6
• D. 0.3

15. In the diagram, angle ABC and angle BCD are right angles, angle BAD = t and  angle EDF = 70o, find the value of t.

• A. 70$$^o$$
• B. 165$$^o$$
• C. 140$$^o$$
• D.110$$^o$$

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