The medical field primarily uses the metric system for measurements. It's the most common measurement system in the world. Many believe the metric system is a more accurate way to give medication. Decimal points are also often used in converting metrics as a short-cut.

What use is maths and why should we learn it?

A forensic scientist could answer that virtually all the mathematics we learn at school is used to solve crimes. Forensic science considers physical evidence relating to criminal activity, and practitioners need competence in maths as well as in the physical, chemical and biological sciences.

Trigonometry, the measurement of triangles, is used in the analysis of blood spatter. The shape indicates the direction the blood has come from. The most probable scenario resulting in blood spatter on walls and floor can be reconstructed using trigonometric analysis. Such analysis can also determine whether the blood originated from a single source or multiple ones.

Suppose a body is found at the foot of a block of flats. Was it an accident, suicide or murder? Using the measured distance from the building together with elementary geometry and dynamics, the forensic scientist can form an opinion as to whether the deceased fell, juangle of a bullet mped or was pushed.

Ballistics calculations, such as computing the ricochet bouncing off a solid surface, use trigonometry. Bullet trajectories determine the distance from shooter to target, and perhaps the height of the gunman and where he was standing when he shot his victim.

The exponential and logarithmic functions, found throughout science, play a key role in forensics. The exponential function relates to processes that depend on the amount of material present as time changes. Rates of heating or cooling, or of the metabolising of alcohol and drugs, are governed by exponential rates of change.

After death, a body cools until it reaches the environmental temperature. By modelling the cooling rate mathematically, using Newton’s law of cooling, an exponential decay of temperature difference is found. This enables estimation of the time elapsed since death. In practice, more elaborate models can be used.

For quantities that vary over many orders of magnitude, such as the concentration of chemicals in the body, the logarithmic function allows us compress them into a more manageable range. The pH scale, which indicates the level of acidity, is of this sort and is often vital in forensic work.

Data analysts use advanced mathematical 
and analytical methods to help businesses investigate complex issues, identify and address inefficiencies, and make strategic, data-driven business decisions.

 Auditors examine and prepare financial records while checking for their accuracy, then explaining their findings to key stakeholders. Internal auditors check for mismanagement of an organization’s funds and identify ways to improve processes for eliminating waste and fraud. External auditors are employed by an outside organization to perform the same tasks, while information technology auditors review controls for their organizations’ computer systems.

Math is extremely important in surgeries.

What role does math play in brain surgery?

Surgical doctors utilize mathematics to do the following: Measure vital signs (temperature, respiration, blood pressure, and pulse). 

Calculate the patient's weight and height. 

Calculate the medicine quantity.