# IGCSE Mathematics Paper-1: Specimen Questions with Answers 62 - 65 of 324

## Question 62

### Write in Short

Solve as a single fraction.

Here,

## Question 63

Edit

### Describe in Detail

Essay▾

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.

## Question 64

### Write in Short

When find the value of

Here, where

So,