MCQ Questions

Question No. 1

Round the following numbers to the nearest 1 000.

Answer :

a) 63 954

b) 123 456

c) 7 290

Question No. 2

Round the following numbers to the nearest million.

Answer :

a) 4 894 653 000

b) 9 015 714 805

c) 1 574 900 000

Question No. 3

Round the following numbers to two d.p.

Answer :

a) 12.734

b) 5.976

c) 0.0602

Question No. 4

Round the following numbers to three d.p.

Answer :

a) 2.0723

b) 0.7316

c) 0.00654

Question No. 5

Round the following numbers to two significant figures.

Answer :

a) 58 699

b) 8.540

c) 205.05

Question No. 6

Round the following numbers to three significant figures.

Answer :

a) 0.01010

b) 0.06540

c) 0.00205

Question No. 7

If Nigeria produces 2.5 million barrels of oil per day:

Answer :

a) calculate how many barrels are produced in five years

b) write the answer to the nearest trillion barrels

Question No. 8

Without using a calculator, estimate the answers to the following.

Answer :

a) 78.24 + 251.30

b) 269.54 − 141.06

c) 37.96 × 62.14

d) 78.24 ÷ 51.30

e) (4.9)³ ÷ (1.15)²

f) 685 ÷ (49 × 11)

g) (37.8 + 62.9) ÷ (58.5 − 37.8)

h) 456.7 × 1.9 ÷ (61.4 ÷ 1.98)

Question No. 9

Decide which category of accuracy each example should belong in and round off appropriately.

Answer :

a) The mass of a tin of beans is 342 g.

b) A car’s maximum speed is 183 km/h.

c) A cake needs 496.5 g of flour.

d) The population of Africa is 1.166 billion people.

Question No. 10

Calculate the following, giving your answer to an appropriate degree of accuracy.

Answer :

a) 18.2 cm × 5.3 cm

b) 48 mm + 59 mm + 71 mm

c) √(65/4)

d) 2π × 6.39

Question No. 11

Estimate using the diagrams.

Answer :

a) Estimate the area of the triangle shown in the diagram.

b) In the diagram MN = 10 m, MR = 6 m and NT = 3 m. Estimate the length of TR to one decimal place.

Question No. 12

Without your calculator, estimate the following.

Answer :

a) √30

b) √175

Question No. 13

One mile is 1 760 yards. Estimate the number of yards in 29 miles.

Answer :

Question No. 14

A cuboid’s dimensions are given as 4.968 cm by 3.2 cm by 2.8 cm. Estimate the volume of the cuboid to the nearest cubic centimetre.

Answer :

Question No. 15

Estimate the area of a circle with diameter 17.25 cm and write your answer to the nearest cm².

Answer :

Question No. 16

The radius of Isikwe’s bicycle wheel is 31.5 cm. How far has he cycled when the wheel has rotated 895 times? Estimate your answer and write it to the nearest metre.

Answer :

Question No. 17

Nigeria has a total area of 923 768 km² and a population of 181 015 000 people. Estimate the average number of people per square kilometre.

Answer :

Question No. 18

(i) Give the lower and upper bounds of each of the following numbers. (ii) Using x as the number, express the range in which the number lies as an inequality.

Answer :

a) 8

b) 6.3

c) 0.9

d) −0.4

Question No. 19

A boy’s mass was measured to the nearest 0.1 kg and recorded as 63.8 kg. a) Give the lower and upper bounds of the mass. b) Using m as the number, express the range in which the number lies as an inequality.

Answer :

Question No. 20

If a length is given as 5.3 m to the nearest 0.1 m, find the upper and lower bounds.

Answer :

Question No. 21

At a sports day, the winning time for the 400 m race was measured as 48.7 s. a) Give the lower and upper bounds of the time. b) Using t as the number, express the range in which the number lies as an inequality.

Answer :

Question No. 22

The time it takes the Earth to rotate around the Sun is given as 365.25 days, correct to two d.p. What are the upper and lower bounds of this time?

Answer :

Question No. 23

Calculate the percentage error in each of the following.

Answer :

a) Mr Okonkwo expected 48 people to turn up for a job interview, but only 40 people turned up.

b) Mobo expected to pay ₦1 500 for his meal at a restaurant, but only paid ₦1 390.

c) Chinasa tries to read 50 pages of her book every day. In one week (seven days) she only managed to read 280 pages.

d) The weight of a box of fruit is given as 5.5 kg, but the actual weight is 5.8 kg.

e) The report said the car park held 360 cars, but we counted only 345 parking spaces.

f) The weather forecast predicted 20 mm of rain, but we actually got 25 mm.

Question No. 24

What is the percentage error in using 3.14 as an approximation for π (3.141592653589793…)?

Answer :

Question No. 25

30 000 fans were expected to attend a football match and only 27 985 arrived at the stadium. Calculate the percentage error.

Answer :

Question No. 26

Calculate (1.25)² using logarithm tables and also using a scientific calculator. What is the percentage error?

Answer :

Question No. 27

A woman expected to spend ₦12 000 shopping but actually spent ₦12 350. Determine the percentage error, correct to one decimal place.

Answer :

Question No. 28

Ikenna does an experiment to find how long it takes an apple to drop 2 m. The theoretical value is 0.64 s but he measures 0.62 s. Calculate the percentage error.

Answer :

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