# maths mock 14/06/15

• Created by: Muneeta
• Created on: 14-06-15 15:32
• 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
• 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.
• 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
• 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
• Data
• mean
• 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