IGCSE Mathematics Paper-1: Specimen Questions with Answers 16 - 16 of 324
Question 16
Describe in Detail Subjective▾
The table above gives the lengths of the rivers, correct to 2 significant figures.
Rivers | Length () |
Nile | |
Amazon | |
Yangtze | |
Yellow River |
(a) List the rivers in order of length, largest to smallest.
________ > ________ > Yangtze > ________.
(b) Use a whole number to complete the statement in the answer space.
The length of Amazon is approximately ________ times the length of Yellow River.
EditExplanation
Here, correct the lengths of the rivers to 2 significant figures:
- Length of Nile will be: 6,900 km because after second significant digit 8 there is 5, so 8 will be rounded and be 9.
- Length of Amazon will be: 7,000 km because after second significant digit 9 there is 9 which is greater than 5, so 69 will be rounded and be 70.
- Length of Yangtze will be: 6,300 km which has already 2 significant figures.
- Length of Yellow River will be: 5,500 km because after second significant digit 4 there is 6 which is greater than 5, so 4 will be rounded and be 5.
(a) Here, list of rivers as per largest to smallest lengths as below:
Amazon > Nile > Yangtze > Yellow River
Because
(b) Here, length of Amazon by using whole number is:
Length of Yellow River by using whole number is:
So, the length of Amazon is approximately 1.2 times the length of Yellow River.
( Calculation: )