# IGCSE Mathematics Paper-1: Specimen Questions with Answers 61 - 63 of 175

## Question number: 61

### Write in Short

(a) Solve and find the value of y when and

(b) Factorize.

### Explanation

Here,

(a)

Now, put and in equation.

So,

.

(b) An integer that divides into another integer exactly is called a **Factor**.

So, **Factorization** is a method of writing numbers as the product of their factors or divisors.

So, we can factorize as below:

## Question number: 62

### Write in Short

Solve as a single fraction.

### Explanation

Here,

## Question number: 63

### Describe in Detail

Solve 0.0000164

(a) In standard form,

(b) Correct to 1 significant figures,

(c) Correct to 6 decimal places

### Explanation

Here, number is 0.0000164

(a) For making standard form of 0.0000164 we need to shift the decimal point left to right five times which will give: .

(b) We need to correct 0.0000164 to **1 significant figures (all non-zero digits are called as significant figures) ** which can be: because here after digit 1 there is 6 which is greater than 5, so 1 will get round up and be 2.

(C) We need to correct 0.0000164 to 6 decimal places which can be: in which we have to consider six numbers after decimal point and the sixth number will be round up on the basis of seventh number.

Here, it means if seventh number is not 5 or more than 5 so sixth number will be as it is.