# IGCSE Mathematics Paper-1: Specimen Questions with Answers 1 - 4 of 324

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## Question 2

### Explanation

Here,

(a) Expression is

(b) **Factorization** is the decomposition of an object into a product of other objects or factors which will give the original object after multiplication.

So,

## Question 3

### Explanation

Here,

- Multiples of 5 include 5, 10, 15, 20, 25,30, 35 etc.
- Multiples of 15 include 15,30, 45 etc.
- So all the multiples of 15 would also be multiples of 5 and hence common multiples of 5 and 15 include 15,30, 45 etc.

## Question 4

### Describe in Detail Essay▾

Rebeca rode to her friend՚s house. She waited for her friend to get ready. Then they cycled together to school. Rebeca՚s journey is shown on the grid.

(a) Work out the speed at which Rebeca cycled to her friend՚s house.

(b) How long did she wait for her friend?

(c) Rebeca՚s brother left home at 7: 30 am. He cycled directly to school at a constant speed of 10 kilometers per hour. Find the time at which he reached at school.

(d) How many minutes earlier than Rebeca did his brother arrive at school?

Edit### Explanation

Here,

(a) For speed of Rebeca:

As shown in chart, time is from 7 to 8: 10 to reach at her friend՚s house =

Distance = 6 km.

So, speed = .

(b) She waits for her friend:

As shown in chart, they go to the school at 8: 50 and she reach at her friend՚s house at 8: 10.

That means she waits tor **minutes**.

(c) Rebeca՚s brother left home at 7: 30 am. He cycled at speed 10

Here, total distance of school from home = 12 km.

So, 10 km = 60 minutes

So, 12 km = ? minutes

he takes to reach at school.

Now, he left home 7: 30 am, so reached at school at:

(d) Rebeca reached at school at 10: 00 am while her brother reached at school at 8: 42 am.

That means **her brother reached at school** **1 hour and 18 minutes earlier**.