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Random sampling
A method of choosing people at random for a survey.
 
Range
The largest number take away the smallest value in a set of data.
 
Rational
A decimal number which ends or is recurring.
 
Reciprocal
"The reciprocal of any number is 1 divided by the number. E.g. the reciprocal of 3 is 1/3.
 
Recurring
A decimal which never ends but repeats all or parts of the sequence of numbers after the decimal point. E.g 0.333333 or 0.141414.
 
Reflex angle
An angle greater than 180 .
 
Regular
A shape with all sides and angles the same size.
 
Remainder
"The amount left over when a number cannot be divided exactly. For example
 
Right angle
An angle of 90 .
 
Rotation
"To turn a shape using an angle
 
Round
To reduce the amount of significant figures or decimal places a number has. For example £178 rounded to the nearest £10 is £180.
 

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