maths mock 14/06/15
- Created by: Muneeta
- Created on: 14-06-15 15:32
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- Maths Revision
- Ratio and Proportion
- Simplify
- write a ratio in its simplist form, find an equivalent to the ratio with the smallest possible whole number values.
- Multiplying and Dividing Ratios
- multiply/divide by the same numbers
- Direct Proportion
- both quantities increse at the same rate
- Inverse proportion
- one quantity increase at the same rate another decreases
- Simplify
- Graphs
- straight line
- all equations of straight lines:x = yx = 7y = -1y = 3x + 2y + x = 52y - 3x = 7
- paralell and perpendicular
- y = 2x + 3 and y = 2x - 4 are parallel because they both have a gradient of 2
- perpendicular lines will always cross at right angles
- You can work out whether 2 lines are perpendicular by multiplying their gradients. The product of the gradient of perpendicular lines will always be -1.
- straight line
- Compound measures
- speed calculations
- Distance = Speed x TimeSpeed = Distance ÷ TimeTime = Distance ÷ Speed
- density calculations
- Mass = Density x VolumeDensity = Mass ÷ VolumeVolume = Mass ÷ Density
- unit conversions
- kilo means 1000, so 1 km = 1000 mcenti means 1/100th, so 1 cm = 1/100thmmilli means 1/1000th, so 1 mm = 1/1000th m
- speed calculations
- Trail and Improvement
- solving cubic equations
- asked to solve an equation where there is no exact answer
- Find the answer to the equation x3 – 2x = 25 to one decimal place
- asked to solve an equation where there is no exact answer
- solving cubic equations
- Data
- mean
- add all the values divide by total number of values
- dont round the answer
- add all the values divide by total number of values
- median
- write values in order of smallest to largest what number is in the middle?
- mode
- value with the most common multiple
- modal groups
- modal group is the group with most data in
- mean
- Ratio and Proportion
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