Page 66 - Mathematics_F1

18. Write 47628.02415 correct to:
(a) 3 significant figures
(b) 2 decimal places
(c) 3 decimal places
(d) 2 significant figures
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(e) 4 decimal places Tanzania Institute of Education
(f) 4 significant figures

19. There are 64 pipes each with a length 4.22 m arranged horizontally end

to end. Estimate the length of all the pipes.

20. A car uses 1.13 litres of petrol to travel a distance of 11.65 km.
(a) Estimate the rate of fuel consumption of the car in km per litre.

(b) Estimate the amount of fuel the car will consume for travelling:
(i) 40.28 km

(ii) 348 km

21. The XYZ cooperative society produces 94 jars of liquid soap every day.
The cost of production of each jar consists of Tshs 4,015 for labour and

Tshs 2,856 for materials. Estimate:
(a) The total cost of producing a jar of liquid soap.
(b) The cost of materials for producing 94 jars.

(c) The cost of labour for producing 94 jars.

22. Estimate the values obtained from each of the given expressions.

(a) 8.7 410× (f) 24.4 0.673÷
(b) 4.17 730× (g) 9.05 18.2÷

(c) 28 0.83× (h) 0.633 425×
(d) 54. 5 1.96× (i) 0.136 8.45÷
Mathematics Form One
(e) 430 31.2÷ (j) 7.40 36.4×

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25/09/2025 15:00:56
Mathematics form 1.indd 59
Mathematics form 1.indd 59 25/09/2025 15:00:56