it can be. It just depends on what you are interested in. If you are interested in a scientific field then it is an amazing way to use your time. But if you are bot interested in science, it is a waste personally.
lol i saw ur comment. so i am answering according to that
i think it depends on what exactly you want to do in terms of math. if you aren't planning on going into engineering or similar fields, concepts like calculus can be a waste of time. however, that being said, I think basic math like adding and subtracting or percentages is very useful because you can use them in everyday life.
To find the length of both segments together, convert the lengths into one unit measure. Convert 500 mm into centimeters by dividing it by 10. 500/10 = 50 cm. Now add 30 + 50 = 80 cm. The segment is 80 cm long.
