# Section One Flashcards Preview

## GCSE OCR MATHS > Section One > Flashcards

Flashcards in Section One Deck (17)
1
Q

What is an integer

A

A whole number

2
Q

What are rational numbers

A

They are either integers, fractions or terminating or recurring decimals

3
Q

What is an irrational number

A

They are never ending, non repeating decimals

4
Q

What is BODMAS

A
```B-Brackets
O-Other things
D-Divison
M-Multiplication
S-Subtraction```
5
Q

What are Multiples

A

The Factors of a number are all the numbers that divide into it

6
Q

What is a prime number

A

A prime number is a number which doesn’t divide by anything, apart from itself and 1 ( however 1 is not a prime number)

7
Q

How to find prime factors

A

Using a factor tree

8
Q

What is LCM and how to find it

A

It is the smallest number that will divide by all numbers in question.

First list all the prime factors that appear in both numbers. If a factor appears more than once in one of the numbers list it the same amount of times and multiply together to give the LCM

9
Q

What is the HCF and how to find it

A

It is the Biggest number that will divide by all numbers in question.

First list all the prime factors that appear in both numbers. Multiply together to find the HCF.

10
Q

Fractions- what is cancelling down

A

Simplifying a fraction

11
Q

Fractions- what are mixed numbers

A

Mixed numbers are numbers with an integer and a fraction part

12
Q

Fractions- How to multiply fractions

A

Multiply top and bottom separately

13
Q

Fractions- How to divide fractions

A

Turn the 2nd fraction upside down and then multiply

14
Q

Fractions- How to get a common denominator

A

Find the lowest common multiple of the denominators

15
Q

Fractions- How to add or subtract fractions

A

First make sure the denominators are the same then add/subtract the numerator only. Convert to improper fractions first

16
Q

How to get a fraction to a decimal to a percentage

A

From a fraction divide to get a decimal and times by 100 to get a percentage

17
Q

How to get a percentage to a decimal to a fraction

A

From a percentage divide by 100 to get a decimal then either use the X method for recurring decimals or for terminating decimals its easy