When children study a type of math and then take a test on it.
You could use a calculator or you could even just use the internet type in the question and u might find the answer. okay but if ur in middle school some of the text book have answers at the back u...
You can work them out on your own any time you have a moment to spare, or you can ask someone who did their homework and learned the material.
Hope this helps! See Related link below
math 7