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Addition: 27 + 54 = 81, or more easily would be 80 + 1 = 81, and so on.

Subtraction: 175 - 94 = 81, or more easily would be 82 - 1 = 81, and so on.

Multiplication: 3 x 27 = 81, or 9 x 9 = 81, and so on.

Division: 567 / 7 = 81, or 81 / 1 = 81, and so on.

“/“, is just another way to put the division sign by the way.

What else can I help you with?