IGCSE Mathematics Paper-1: Specimen Questions with Answers 32 - 32 of 324

Question 32

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Essay▾

The table above gives the areas of forests of different countries, correct to 4 significant figures.

The Table Above Gives the Areas of Forests of Different Countries
Forests of Countries

Area ()

Russia

Brazil

Canada

United States

(a) List the Forests of Countries in order of area, smallest to largest.

________ < Canada < ________ < ________.

(b) Use a whole number to complete the statement in the answer space.

The area of forests of Russia is approximately ________ times the area of forests of Canada.

Explanation

Here, correct the area of the countries to 4 significant figures:

  • Area of forest of Russia will be: 7,763,000 because after fourth significant digit 2 there is 6 which is greater than 5, so 2 will be rounded and be 3.
  • Area of forest of Brazil will be: 4,777,000 because after fourth significant digit 6 there is 9 which is greater than 5, so 6 will be rounded and be 7.
  • Area of forest of Canada will be: 3,101,000 because after fourth significant digit 1 there is 3 which is less than 5, so 1 will remain same.
  • Area of forest of United States will be: 3,031,000 because after fourth significant digit 0 there is 8 which is greater than 5, so 0 will be rounded and be 1.

(a) Here, list of countries as per smallest to largest areas as below:

United States < Canada < Brazil < Russia

Because

(b) Here, area of forests of Russia by using whole number is:

Area of forests of Canada by using whole number is:

So, the area of forests of Russia is approximately 2.5 times the area of forests of Canada.

(Calculation: )

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