# IGCSE Mathematics Paper-1: Specimen Questions with Answers 309 - 313 of 324

## Question 309

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### Write in Short

x is an integer between 50 and 80.

Write down the value of x when it is

A prime factor of 154

### Explanation

is a composite number

Factor pairs:

Factors of

is an integer between and

So, answer is is between and.

## Question 310

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### Write in Short

From the list above, write down

An irrational number.

### Explanation

• An irrational number is a real number that cannot be written as a simple fraction.
• In those number
• Which is not an integer and therefore is an irrational number

## Question 311

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### Write in Short

A and B are two points marked on a map.

By measuring a suitable angle, find the bearing of A from B.

### Explanation

• In measuring angle always measure bearings from the north line going clockwise
• The bearing of A from B refers to the angle which is measured from the point A looking at B.

The sum of interior angles of same side of transversal

## Question 312

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### Write in Short

Write down the equation of a line through (0,0) parallel to .

Here

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