10. THINK ABOUT THE PROBLEM BY YOURSELF AT LEAST 5 MINUTES.

When you see the suggested answer in your text without your thinking, you will get nothing. On the other hand, I don’t say that you should keep making answer until you leach a “final answer” on every problem. It may be the waste of your time.
So I advise you have to take “the middle way”. You should think about at least 5 minutes in solving Math problems.
Next, see the 15th method for more details.

See you next.

Nasuno Kumao