Like fractions are the fractions which have the same denominator and unlike fractions are the fractions which do not have the same denominator.
You basically have to learn separately how to do different things with fractions, including finding a common denominator; converting fractions to a different denominator; simplifying fractions; adding and subtracting fractions; multiplying fractions; dividing fractions.
We can only add or subtract fractions if they have the same denominators
Equivalent fractions are fractions that have the same value as another fraction.
If the denominators are not the same, then you have to use equivalent fractions which do have a common denominator . To do this, you need to find the least common multiple (LCM) of the two denominators. To add fractions with unlike denominators, rename the fractions with a common denominator. Then add and simplify.
I never heard about "four fundamental fractions". There is a concept of fundamental operations, which refers to addition, subtraction, multiplication and division, but I don't think that "fundamental fractions" has any commonly-accepted meaning in math.
A fundamental element, principle, or skill.
It is not particularly important to know the principle: knowing how and when to apply it is good enough. A postgrad degree in maths and 30 years in the profession and I did not even know what it meant until I saw this question and did a bit of research!It is important because it enables you to rescale (rename) fractions which allows you to perform addition and subtraction.
What are some improntant fundamental principles
A principle is a fundamental truth or belief that guides behavior, while a principal is a person in a leading position, such as the head of a school.
constitution
behaviour of accountant
basic principle of accounting
basic principle of accounting
tenet
fundamental principle
A fundamental truth or proposition that serves as the foundation for a system of belief or behavior is called "Principle", Whereas An established or official way of doing something is called "Procedure".