What's a quick and easy way to double digit multiplication?
1、 Two digits multiplied by two digits. 1. More than ten times more than ten: pithy formula: head multiplied by head, tail plus tail, tail multiplied by tail. Example: 12 × 14 =? 1 × 1 = 12 + 4 = 62 × 4 = 812 × 14 = 168. Note: if the number of digits is multiplied by each other, 0 should be used for less than two digits
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