Research-based guidance and classroom activities for teachers of mathematics

Measurement scales

Measurement scales is a theme within connecting measurement and decimals. Links to relevant activities and resources are on the right hand side of this page. 

Measurement scales are used to quantify variables. Such scales are commonly classified as nominal, ordinal, interval, and ratio, depending on the quantity being measured. Interval scales (such as measuring temperature) and ratio scales (including the measurement of length, area, volume, angle, and so on) are most often of concern in mathematics.

Another distinction in measurement is between discrete scales of measurement and continuous scales. In practical situations involving use of a measurement instrument, be this a ruler for measuring length or a laser device for measuring room size, there is always the issue of approximation.