There is no single math class that is the most useful, as different branches of math have different practical applications in various fields.
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Mathematics is a vast subject that encompasses several branches, including algebra, geometry, trigonometry, calculus, probability, and statistics. Therefore, determining which math class is the most useful is subjective to an individual’s interests and field of study. As Bill Gates, the cofounder of Microsoft, once said, “The 21st century will be dominated by people who are fluent in math and extrapolation.”
Here are some facts about different branches of math and their practical applications:

Algebra: Algebra is widely used in various fields, including finance, economics, engineering, and science. It is used to solve equations, to analyze and represent data, and to make predictions.

Geometry: Geometry is essential in the field of architecture, as it is used to design and construct buildings. It is also used in the fields of physics, astronomy, and navigation.

Trigonometry: Trigonometry is used extensively in the fields of engineering, physics, and architecture. It is used to calculate distances, heights, and angles.

Calculus: Calculus is the branch of mathematics that deals with rates of change and motion. It is widely used in the fields of physics, engineering, economics, and statistics.

Probability: Probability is the study of chance and uncertainty, and it is used extensively in the fields of finance, insurance, and gambling. It is also used in scientific research and computer science.

Statistics: Statistics is used widely in social sciences, like psychology, sociology, and political science. It is also used in sampling, data analysis, and decisionmaking in business and finance.
In conclusion, each branch of math has its own unique applications in various fields, making it challenging to determine which math class is the most useful. As famous mathematician John von Neumann once said, “In mathematics, you don’t understand things, you just get used to them.” Therefore, it is important to get familiar with all branches and master the ones most relevant to your area of interest.
Here is a table summarizing the practical applications of different branches of math:
Branch of Math  Practical Applications 

Algebra  Finance, economics, engineering, science 
Geometry  Architecture, physics, astronomy, navigation 
Trigonometry  Engineering, physics, architecture 
Calculus  Physics, engineering, economics, statistics 
Probability  Finance, insurance, gambling, scientific research, and computer science 
Statistics  Psychology, sociology, political science, business, and finance 
See related video
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Calculus provides the framework that makes a wide variety of modeling systems possible. Calculus has applications across a wide variety of technical and scientific fields. Calculus is used by: all types of engineers.
After taking a variety of math classes during the math major, I found linear algebra to be super important. I’ve found it creep into other classes very frequently. Being able to understand how matrices work and the basic theory of vector spaces is very helpful in doing higher dimensional calculus and real analysis, thinking about the solutions of differential equations and as a great example of some complex phenomena in abstract algebra.
When I was done with undergrad, I felt a nagging need to restudy linear algebra. I didn’t appreciate its applications I would end up encountering later on while I was in the class, so I thought going back over it might be interesting and illuminating. It really was.
In addition, people ask
Similarly one may ask, What math class is the easiest to take?
What is the Easiest Math Class in College?
 Statistics: Statistics is a branch of mathematics dealing with the collection, analysis, and interpretation of numerical data.
 Finite Math: Finite math refers to a variety of math courses that do not involve calculus.
Keeping this in consideration, What math is harder than calculus?
The response is: In general, statistics is more vast and covers more topics than calculus. Hence, it is also perceived to be more challenging. Basic or entrylevel statistics is much easier as compared to basic level calculus. Advance level statistics is much much harder than advanced level calculus.
Which is harder algebra or calculus?
Response: Calculus is the hardest mathematics subject and only a small percentage of students reach Calculus in high school or anywhere else. Linear algebra is a part of abstract algebra in vector space. However, it is more concrete with matrices, hence less abstract and easier to understand.
What is the hardest math? Response will be: 5 of the world’s toughest unsolved maths problems
 Separatrix Separation. A pendulum in motion can either swing from side to side or turn in a continuous circle.
 Navier–Stokes.
 Exponents and dimensions.
 Impossibility theorems.
 Spin glass.
In respect to this, What is the most useful math class?
The most useful mathematics class you will ever learn is in first and second grade. However if you want the most advanced mathematics class, then it is statistics that is the most useful. Originally Answered:
Besides, What math class should I take in high school? The math class you take your freshman year of high school depends on your previous math experience and grades from middle school. You will most likely be required to take a year of geometry and at least one year of algebra while in high school.
Are math classes important to college?
The response is: For students planning on majoring in humanities, the social sciences, or a similar field, the math classes you took in high school will not be as important to colleges because they’ll be looking more at the classes that relate to your intended major.
Is math the most useful subject? Math is not the MOST useful subject but it’s high up there. Now math is important based on who you become. If you are a mathematician then yes, math is very important to you. If you pick something else like take for example the lowest paying job ever. You still need to buy clothes and food and stuff.