The difference is 693.
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One good fact about the number 1089 is: pick a 3 digit number (they cannot be the same) i.e 123 reverse it 321 take the smallest amount from the largest 321-123=198 take the answer and reverse it 891 then add that number to the answer of the subtraction 891+198=1089 no matter what 3 numbers you use you will always end up with 1089 for the answer.
1 and 891 are a possible pair.
74.25
The number halfway between two values is the average of those values. To find the average of 180 and 198, you add them together and divide by 2: (180 + 198) / 2 = 378 / 2 = 189. Therefore, 189 is the number halfway between 180 and 198.
Yes.