Correct: 1234-1235= -1, 5555*16=88880, 65869+1346=67215, 7228*34=245752, 30+31+31+31=123, Incorrect: 35678*98=7654290, 2345+2100=4545, 0*12345=12345, 678+900000=900679, 6666-5555=1112,

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