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I'll take the GMAT the 15th of this month, I still have this week to study hard. I know most of the subjects (time/distance, average, time work, triangles, mixture, integer...) But I realize there is something which seems quite simple for everybody but that I can't do it right 100% of the time : LCM or GCD (Least common multiple and greatest common divisor)
I've already looked the lesson in gmat and in the books it's not always very clear. Can someone take 2-3 examples and show me how to find it, especially how to choose the number after you do the prime factorization...
I feel quite stupid to ask this because it seems it's very simple but I really got a problem there so I hope someone can help. thanks guys.