When mixing homemade cleaning solutions, you often need to use precise ratios.
To express complex fractions (fractions with a numerator greater than one), combine a cardinal number and an ordinal number. Because you are counting "parts" (the implied masculine noun hlutar), follow these rules:
- Numerator: A cardinal number. If it inflects (1–4), use the masculine plural form (e.g., fjórir for 4).
- Denominator: An ordinal number in the weak plural form, which always ends in -u (e.g., fimmtu for fifths, tíundu for tenths).
When specifying a fraction of an ingredient, use the preposition af, which requires the following noun to be in the dative case.
| Four fifths of the homemade glass cleaner are just water. | Fjórir fimmtu af heimatilbúna glerhreinsinum eru bara vatn. |
| Nine tenths of the concentrate are a natural cleaning product. | Níu tíundu af þykkninu eru náttúrulegt hreinsiefni. |
| The student cleans five sixths of the dirt with the cleaning product. | Nemandinn þrífur fimm sjöttu af óhreinindunum með hreinsiefninu. |
| We use seven eighths of the baking soda for the bathtub. | Við notum sjö áttundu af matarsódanum í baðkarið. |
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