I use Club 91 as a fun way to sharpen my students’ math skills. If they can beat the calculator, then they can join Club 91. To divide by 91, one must keep in mind that their are two routines to know before you begin. Today, I will show you what to do when the number to be divided ends in zero. The next lesson I will show you what to do when the number does not end in zero. After you give this a try, practice in your mind so you can beat the calculator. Have fun.

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