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456 + 789 + 123 + 123456789 = 123458157
789 + 456 = 1245
84.
987 minus 789 equals 198. This calculation involves subtracting the hundreds, tens, and ones places of the two numbers. In this case, 9 minus 7 equals 2 in the hundreds place, 8 minus 8 equals 0 in the tens place, and 7 minus 9 requires borrowing from the hundreds place, resulting in 10 minus 9 in the ones place.
789 x 789 = 622521.