A simple method to calculate the value of 8 * 8 18 * 18 28 * 28 38 * 38 48 * 48 58 * 58 68 * 68 78 * 78 88 * 88 98 * 98

8*8=（10-2）*（10-2）=100-2*20+4=64
18*18=（20-2）*（20-2）=400-2*40+4=324
…… and so on

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