This is a simple exercise in preparation for more to come. Pick a 2-digit number and quickly get the answer if you minus that number from 100. Example: pick 28, think 72; pick 76, think 24. Flick a page from a novel and take the last two digits, then think of the answer right away. If you can write a simple Excel program to generate 2-digit random numbers, you could do this exercise very effectively. In no time you will be able to get the answer as soon as you see the number.
Next will be multiplying by 99...
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