CIE Mathematics Paper-1: Specimen Questions 38 - 39 of 175

Question number: 38

Short Answer Question▾

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The diagram shows a pole of length l centimeters.

A pole of length l centimeters

A pole of length l centimeters

Find the below given calculations

(a) Mita says that l = 88.2. Round this to nearest whole number.

(b) If the pole has a length 86 cm, to the nearest centimeter. What can be said about l.

Explanation

Here,

(a) Mita says that l = 88.2 cm.

So, for round this to the nearest whole number we need to see the digit after decimal point, if this digit is 5 or more than 5 then the digit before decimal point will increase by 1.

Here, the digit after decimal point is 2 which is less than 5, so digit 8 which is before decimal point will remain same.

So, length will be: 88 cm after rounding up.

(b) In fact the pole has a length 86 cm, to the nearest centimeter.

Then the nearest length can be:

(I) Less than 86 but more than 85.4: 85.5,85.6,85.7,85.8,85.9 these all will round up and be 86 because digit after decimal point is 5 or more than 5.

(II) More than 86 can be: 86.1,86.2,86.3,86.4 these all will also round up and be 86 because digit after decimal point is less than 5.

Question number: 39

Short Answer Question▾

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Solve 6y=1 Write down the value of y.

Explanation

Here, 6y=1 is given, so we can get only the value 1 when there is exponent 0 on any number.

So, here 60=1, so y=0.

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