ABCDEFGHIJKLMNOPQRSTUVWXYZ
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X123456789101112
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1123456789101112
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224681012141618202224
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3369121518212427303336
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448162024283236404448
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55102530354045505560
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661236424854606672
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7714495663707784
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88166472808896
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9918819099108
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101020100110120
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111122121132
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121224144
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The problems in yellow are the only problems you need to memorize.
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The green are the opposite of the yellow so if you know 5X4, you don't need to memorize 4X5.
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I'd bet even some of these you can cross off the list!
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