If you were ill, and had to find out whether your temperature was raised or not, you would have to use decimals to judge this. (At least, if you were using Celsius you would need to use decimals). Likewise, if you were to use cookery thermometers to assess how "cooked" a steak or sugar syrups are.
Alternatively, when using an electronic weighing scale to weigh out substances for which accuracy is crucial (e.g yeast, agar, emulsifiers, a chemist weighing drugs etc...) - all substances which must be weighed on a scale which can measure "0.001" of a gram.
Capacity of car engines are measured in decimals - e.g 1.2 litre engine.
If you have to calculate how much carpet you need to cover a room - the length, width or area are very unlikely to come out as a whole number.
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You can use decimals in money.
Math (or maths) is not a job and so engineering does not use math as a job!Math (or maths) is not a job and so engineering does not use math as a job!Math (or maths) is not a job and so engineering does not use math as a job!Math (or maths) is not a job and so engineering does not use math as a job!
A math teacher or a mathematician.
For a complete guide on when to use simultaneous method in indices maths visit mathsrevision.net/gcse-maths-revision/algebra/simultaneous-equations
Decimals are used in money. There is a real difference between a 1.99 and 199.00.