# Mathematics 2021 Past Questions | JAMB

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. Solve the following equation: $$\frac{2}{(2r – 1)}$$ – $$\frac{5}{3}$$ =  $$\frac{1}{(r + 2)}$$
• A. ( 1,$$\frac{5}{2}$$ )
• B. ( 1,-$$\frac{5}{2}$$ )
• C. ( $$\frac{5}{2}$$, 1 )
• D. (2,1)

2. In how many ways can 2 students be selected from a group of 5 students in a debating competition?

• A. 25 ways
• B. 10 ways
• C. 15 ways
• D. 20 ways

3.  What is the rate of change of the volume V of a hemisphere with respect to its radius r when r = 2?

• A. 8π
• B. 16π
• C. 2π
• D. 4π

4.  determine the maximum value of y=3x2+ 5x – 3

• A. 6
• B. 0
• C. 2
• D. 4

5.  A trapezium has two parallel sides of length 5cm and 9cm. If the area is 91cm2, find the distance between the parallel sides

• A. 13 cm
• B. 4 cm
• C. 6 cm
• D. 7 cm

6.  find the value of p if the line which passes through (-1, -p) and (-2p,2) is parallel to the line 2y+8x-17=0?

• A. −2/7
• B. 2/7
• C. −6/7
• D. 6/7

7. The ratio of the length of two similar rectangular blocks is 2 : 3. If the volume of the larger block is 351cm3, then the volume of the other block is?

• A. 234.00 cm3
• B. 526.50 cm3
• C. 166.00 cm3
• D. 687cm3

8. Find the derivatives of the function y = 2x2(2x – 1) at the point x = -1?

• A. 18
• B. 16
• C. -4
• D. -6

9.  Correct 241.34(3 x 10-3)2to 4 significant figures

• A. 0.0014
• B. 0.001448
• C. 0.0022
• D. 0.002172

10. Find the mean deviation of 1, 2, 3 and 4

• A. 1.0
• B. 1.5
• C. 2.0
• D. 2.5

11. At what rate would a sum of N100.00 deposited for 5 years raise an interest of N7.50?

• A. %
• B. 2%
• C. 1.5%
• D. 25%

12. Three children shared a basket of mangoes in such a way that the first child took 1/4 of the mangoes and the second 3/4 of the remainder. What fraction of the mangoes did the third child take?

• A. 3/16
• B. 7/16
• C. 9/16
• D. 13/16

13. Simplify and express in standard form $$\frac{0.00275 \times 0.0064}{0.025 \times 0.08}$$
• A. 8.8 x 10-1
• B. 8.8 x 10-2
• C. 8.8 x 10-3
• D. 8.8 x 103

14.   Simplify $$\sqrt{27}$$ + $$\frac{3}{\sqrt{3}}$$

• A. 4$$\sqrt{3}$$
• B. $$\frac{4}{\sqrt{3}}$$
• C. 3$$\sqrt{3}$$
• D. $$\frac{\sqrt{3}}{4}$$

15.  Three brothers in a business deal share the profit at the end of a contact. The first received 1/3 of the profit and the second 2/3 of the remainder. If the third received the remaining N12000.00 how much profit did they share?

• A. N60 000.00
• B. N54 000.00
• C. N48 000.00
• D. N42 000.00

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