Flashcards
Maths Formulas
Flashcards do conjunto (33)
- 1Recurring Fractions to Decimals1.) Multiply the sequence by a power of 10 so that first part of a repeated portion is in front of decimal point
2.) Subtract to get a whole number
3.) That number would be 9(999)x
4.) Solve for x and simplify - 2Find a percentage of somethingDivide number by 100 and multiply by percent
(Divide by 100 is 1% and multiply by percent makes it that percent) - 3Increasing number by percentMultiply by 100 and [number] percent
(Convert to decimal) - 4Decreasing number by percentMultiply by what's left of that number when you subtract from 100 (100%-%)
(Convert to decimal) - 5Reverse percent: increasedO.P. x 1.% = S.P.
S.P. ÷ 1.% = O.P. - 6Reverse percent: decreasedO.P. x 0.% = S.P.
S.P. ÷ 0.% = O.P. - 7Factorizing: Common FactorTake out common factor & put remainder in brackets
- 8Factorizing: Difference of Two SquaresTake square root of each number and put in brackets twice
(One adding, one subtracting) - 9Factorizing: InspectionFind factors of the constant that add up to the letter term
OR
1. Multiply number in front of the squared by the constant
2. Find factors of that that add up to the letter term
3. Group and remove the common factor
4. Regroup - 10Completing the Square1. Divide the 'bx' by two, and place it as a square in the brackets
2. Subtract the product of the 'c^2' , then add/subtract so you'll get the final term - 11Solving QuadraticsUse formula:
-b +/- √ b - 4ac
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2a - 12Graphing Quadratcicsy = ax^2 + bx + c
^2 = one curve
^3 = two curves
c = y intercept - 13Finding the Vertex-b
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2a - 14Simultaneos EquationsEg:
4x + 4y = 12
- 4x - 2y = 0
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6y = 12
y = 2
Solve for variable "x" - 15Probability: "and" (e.g. P(red and blue))Multiply the two probabilities
- 16Probability: "or" (e.g. P(red or blue))Add the two probabilities
- 17Pythagorain theorema^2 + b^2 = c^2
a = leg
b = leg
c = hypotenuse - 18Finding an angle of a right-angled triangleSOH CAH TOA
S = sine; C = cosine; T = tan
A = adjacent to angle; O = oppisite to angle; H = hypotenuse - 19Simple Interest (gets the interest)Principle x Rate x Time
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100 - 20Compound Interest (gets principle and interest)Appreciation: Principle (1 + rate/100)^time
Depricatoin: Principle (1 - rate/100)^time - 21Direct Poportion1. Take the thing that is only mentioned once and multiply it by the fraction of the other two
2. Since it should get bigger, put the bigger one on top - 22Direct Proportion (Variation)y = kx
- 23Inverse Proportion1. Take the thing that is only mentioned once and multiply it by the fraction of the other two
2. Since it should get smaller, put the smaller one on top - 24Inverse Proportion (Variation)y = k/x
- 25Scale FactorLSF = 2D
ASF = LSF^2
VSF = LSF^3 - 26Range of Valuesn1 < x < n2
- 27Range of Values on a NumberlineShaded circle - includes value
Unshaded circle - doesn't include value - 28Mean from Grouped DataE (mid-value X frequency)
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E frequency
(E : the sum of all values) - 29Median from Grouped DataClass that contains middle value
- 30Mode from Grouped DataClass that contains the highest frequency
- 31HistogramsF / I = F.D.
Frequency / Interval = Frequency Density - 32Area of a Segment of a Circleπ(r^2)angle
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360 - 33Circumference of a Segment of a Circle(2πr)angle
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360
Informações
- Descrição
- Formulas needed for Mathematics. (Level: Y9; G8; M3)
- Criado por
- Amy Daniels
- Visualizações
- 40
- Tags
- Avaliação