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A unit number is a numeric value with a unit attached — 30 yr, 5.2 m, 375000 USD, 60 mph. The unit is part of the value, which lets TrueMath convert between compatible units and catch dimensional mistakes.

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Writing unit numbers

Write the value followed by a unit suffix. The space is optional — 5m and 5 m are identical:
Both simple and compound suffixes work. The suffix must be a recognized unit; see Units for the full catalog. Writing a unit inside an activity equation has one extra wrinkle — a bare suffix can collide with a variable name — covered in Writing equations.

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Behavior

  • Automatic conversion. Compatible units convert when combined: 1m + 10cm yields a length, with no manual conversion.
  • Dimensional safety. Incompatible combinations are rejected: 5m + 3kg is an error. See Combining types.
  • Derived dimensions. Multiplying and dividing units produces compound units — a distance over a time is a velocity; a cost over an area is a cost-per-area.

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Precision

Like all values, unit numbers are carried at full precision through every step; rounding happens only at display. A value’s unit and decimal display are governed by the variable’s format. See Units and precision.