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We have loved mathematics since childhood. Learn to learn to learn to learn to learn how to do a favor. Please ask all good people to do a favor!
Learning * number = learning, number is not equal to 1.
So there are 2 * 6 = (1) 2,4 * 6 = (2) 4,5 * 3 = (1) 5 * 7 = (3) 5,5 * 9 = (4) 5.
8*6=(4)8 and so on. (As a breakthrough, bring in number * number+carry = learn to check)