Crunches will definitely tone up your stomach, but as the poster below stated, it takes time. I recommend not focusing on a number but rather doing them until you can't anymore. Also, be sure to do all different types of crunches (reverse, side, normal, and vertical) to target all areas of your stomach.
Cardio, as the poster below stated, will help burn fat from all over, including your stomach. It's the best way to slim down, and from my experience, the fastest.
Good Luck!
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