CIE Mathematics Paper-1: Specimen Questions 16 - 16 of 175

Question number: 16

Essay Question▾

Describe in Detail

The table above gives the lengths of the rivers, correct to 2 significant figures.

The table above gives the lengths of the rivers.

In detail The table above gives the lengths of the rivers.

Rivers

Length ( km )

Nile

6, 853

Amazon

6, 992

Yangtze

6, 300

Yellow River

5, 464

(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.

Explanation

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 6,992>6,853>6,300>5, 464

(b) Here, length of Amazon by using whole number is: 6,992km

Length of Yellow River by using whole number is: 5, 464km

So, the length of Amazon is approximately 1.2 times the length of Yellow River.

( Calculation: 5, 464×1.2=6,556~6,992km )

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