Maths Math revision card :) 3.5 / 5 based on 3 ratings ? MathematicsAlgebraGCSE Created by: Sophie AthertonCreated on: 08-05-11 17:11 Types of number Square numbers - 1, 4, 9, 16, 25, 36, 49, 64, 81, 100, 121, 144, 169, 196, 225 Cube numbers - 1, 8, 27, 64, 125, 216, 343, 512, 729, 1000 Powers - For example 2 to the power of 3 would be 2 x 2 x 2 which is 8 Prime numbers - A prime number is a number that divides only by 1 and itself. The prime numbers are - 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43 etc 1 of 8 LCM and HCF LCM - Lowest common multiple E.g. 6 and 7 6 - 6, 12, 18, 24, 30, 36, 42, 48, 54, 60, etc 7 - 7, 14, 21, 28, 35, 42, 49, 56, 63, 77, etc So the LCM of 6 and 7 is 42 HCF - Highest common factor E.g. 36 and 54 36 - 1, 2, 3, 4, 6, 9, 12, 18, 36 54 - 1, 2, 3, 6, 9,18,27,54 So the HCF of 36 and 54 is 18 2 of 8 Fractions and Decimals Multiplying - Multiply the top and bottom seperatley. E.g 3/5 x 4/7 = 3 x 4 = 12 5 x 7 = 45 So... it equals ... 12/45 Dividing - Turn the 2nd fraction upside down then multiply E.g. 3/4 / 1/3 = 3/4 / 3/1 = 3x3/4x1 = 9/4 Adding and subtracting - Only add/subtract the top line but only if the bottom numbers are the same E.g. 2/6 + 1/ 6 = 3/6 5/7 - 3/7 = 2/7 Cancelling down - Divide the top and the bottom by the same E.g. 18/ 24 cancels down to 6/8 by dividing by 3, then that cancels down to 3/4 by dividing by 2. 3 of 8 Algebra Simplifying - Also known as 'collecting like terms' E.g. 2x-4+5x+6 2x+5x = 7x -4 +6 = 2 7x + 2 Multiplying out brackets - Taking the brackets away by multiplying E.g. 3(2x + 5) 3 x 2x = 6x 3 x 5 = 15 6x + 15 4 of 8 Algebra continued Factorising - Putting the brackets in E.g. X2 + 5X + 6 Find two numbers that add together to get 5X and times together to get 6 So in this case 2 and 3 (x + 2) (x + 3) is the answer Another one .... X2 + 7x + 6 So two number that add together to get 7x and times togetehr to get 6 are ... 1 and 6 (x + 1) (x + 6) is the answer 5 of 8 Y = M X + C Y = MX + C Y = Value of Y M = Gradient X = Value of X C = Intercept E.g. 2Y = 4X + 2 Its easier if you get Y by itself so divide it by two Y = 2X + 1 Then with this in formation make a table X 0 1 2 3 4 Y 1 3 5 7 9 With this data you can make a graph 6 of 8 Surds Surds E.g. 45 = 5 x 9 = 3 5 E.g. 108 = 9 x 12 = 3 12 When using surds you always need to use the surd sign ( ). Also, when x's two numbers, remember one of them needs to be a square number! Finally! When cancelling down the square number remember to put it BEFORE the symbol! 7 of 8 Nth Term The Nth Term E.g. 5, 14, 23, 32 9 9 9 9 So the difference is 9 so the beggining of the equation will be 9X Next... you do 9x1 to get 9 so to get 5 you need to -4 To make sure of this try with the next one.... 9x2= 18 to get 14 - 4 So the answer is 9X - 4 Remember to repeat the number by 1, 2, 3, etc to make sure it is the right answer! 8 of 8
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