# Mathematics 2021 Past Questions | WAEC

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

- Correct, 0.00798516 to
**three**significant figures

- A. 0109
- B. 0800
- C. 00799
- D. 0.008

**2. **Simplify (11_{two})^{2}

- A. 1001
_{two} - B. 1101
_{two} - C. 101
_{two} - D. 10001
_{two}

**3. **Solve = 2\(^\sqrt{2x+1}\) = 32

- A. 13
- B. 24
- C. 12
- D.11

**4. **If log_{10}^{2} =m and log_{10}^{3} =n, find log_{10}^{24 }In term of m and n.

- A. 3m+n
- B. m+3n
- C. 4mn
- D. 3mn

**5. **Find the 5^{th} 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)} = 4^{x} x 8^{(1-x)}, find the value of x.

**A. -4****B. 4****C.**1**D.**-1

**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 = 70^{o}, find the value of t.

**A.**70\(^o\)**B.**165\(^o\)**C.**140\(^o\)**D.**110\(^o\)