# Maths Unit 2 Edexcel GCSE

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• Created by: Siana
• Created on: 13-06-13 11:06
What is a factor?
Numbers you multiply together to form another number.
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What is a multiple?
The result of multiplying a number by an integer.
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What are the prime numbers under 100?
2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89 and 97.
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How do you find the highest common factor?
Here are the list of prime factors of 24 and 36: 24 = 2 x 2 x 2 x 3 36 = 2 x 2 x 3 x 3 If we write down the numbers that are the same in both lists, they will give us the highest common factor of 24 and 36: HCF of 24 and 36 is 2 x 2 x 3 = 12
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How do you find the lowest common factor?
Which list has the most of each factor. 24 = (2 x 2 x 2) x (3) 36 = (2 x 2) x (3 x 3) 24 has the most 2s. (it has three 2s). And 36 has the most 3s (it has two 3s). So the LCM of 24 and 36 is (2 x 2 x 2) x (3 x 3) = 72.
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N0=
1
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N-1
1/N
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N1/2
square root N
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N1/3
square root 3N
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Converting recurring decimals into fractions
Times the decimal by 10/100/1000 depending on the number of decimal points and take the original away from it and use the answer over 9/99/999 as the fraction.
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Easiest way to work out a percentage?
Divide smaller number by the denominator. Times by 100.
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What is a surd?
Awkward square root. A square root that doesn't give an exact integer answer.
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Line equation
y=mx+c
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What is m?
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What is c?
y-intercept
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rise/run
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Parallel lines
Same m (gradient). Change c to anything (within reason).
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Perpendicular
Gradient= 1/-m. Then y-intercept work out if given a point, or stays the same.
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1kg - ?pounds
2.2pounds
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1litre - ?pints
1 3/4pints
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4.5liters - ?gallon
1gallon
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8km - ?miles
5miles
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30cm - ?foot
1foot
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1cm3 - ?ml
1ml
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## Other cards in this set

### Card 2

#### Front

What is a multiple?

#### Back

The result of multiplying a number by an integer.

### Card 3

#### Front

What are the prime numbers under 100?

### Card 4

#### Front

How do you find the highest common factor?

### Card 5

#### Front

How do you find the lowest common factor?