Definition
Standard unit
A standard unit has an agreed fixed size, so measurements can be compared.
Continue from this idea into connected AXIO math.
What it means
Hand spans and footsteps change from person to person. Standard units do not. Using centimetres, metres, kilograms, litres, or seconds lets different people measure with the same-sized unit.
Remember it
Same-sized units give measurements that other people can repeat and trust.
Example
Two children measure a desk with centimetre rulers. Both get 120 cm because every centimetre has the same standard size, even though the children have different hand spans.
Watch for
A standard unit is not one unit used for everything. Choose a unit that matches the quantity: length, mass, capacity, time, temperature, or another measure.
Common mix-up
A non-standard unit, such as one person’s hand span, can compare objects but may give a different number for a different measurer.
Exact meaning
A standard unit is a measurement unit with an agreed, fixed size that people use consistently so results can be repeated and compared.