I'm not sure exactly what it means in mathematics, other than putting similar things into groups.
So I guess you could answer with organizing similar things into group like the heights, favorite colors, ages, and grades of people in your class or something.
Is that what you're looking for?
Answer: 120 degrees
Step-by-step explanation: a circle always has a total of 360 degrees
Answer:
The answer is false because the last digit of any number must end with 0 or 5 to be divisible by 5
Step-by-step explanation: