What is the mantissa of 777 times 888 times 999?

The mantissa rule of the power of 7: 7,9,3,1, and then cycle, 777 divided by 4, so the mantissa is 7
The mantissa rule of the power of 8: 8,4,2,6, and then cycle, 888 divided by 4 and 0, so mantissa is 6
The mantissa rule of the power of 9: 9, 1, and then cycle, 999 divided by 2 and 1, so the mantissa is 9
The mantissa of 7 * 6 * 9 is 7

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