Section 1 - Numbers

Question 1

What’s the difference between rational and irrational numbers?

Answer 1

Rationalise can be written as fractions, irrationals can’t.

Question 2

How to find prime factors

Answer 2

Factor tree

Question 3

How to find lowest common multiple

Answer 3

List all multiples and the lowest one they share is the lcm

Question 4

How to find highest common factor

Answer 4

List prime numbers then times them all together

Question 5

When you divide fractions you…

Answer 5

…turn the 2nd fraction upside down then multiply

Question 6

How do you get from a fraction to a decimal to a percentage

Answer 6

Divide
X by 100

Question 7

How to turn a recurring decimal into a fraction (3)

Answer 7

× by power of 10 to move past decimal

Subtract the origional

Simplify

Question 8

How do you convert a decimal where the recurring bit doesn’t come straight after the decimal point into a fraction

Answer 8

Multiply by power of 10 to move non recurring but past the point

Multiply again to get it all across

Takeaway a from b

Question 9

How to multiply/ divide by standard form (3)

Answer 9

Front number x front number

Power of 10 x power of 10 ( just add the powers)

Keep answer in standard form

Question 10

How do you add / subtract with standard form (3)

Answer 10

Make powers of 10 the same

Add / subtract front numbers

Make sure it’s in standard form at end