102 * 98 = (100 + 2)(100 - 2) = 100² - 2² = 10 000 - 4 = 9 996
106 * 94 = (100 + 6)(100 - 6) = 100² - 6² = 10 000 - 36 = 9 964
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102 * 98 = (100 + 2)(100 - 2) = 100² - 2² = 10 000 - 4 = 9 996
106 * 94 = (100 + 6)(100 - 6) = 100² - 6² = 10 000 - 36 = 9 964