All of them.
12345 + 12345 = 24690
0.9134
12345
1+12+123+1234+12345+123456+1234567+12345678+123456789+12345678910+1234567891011+123456789101112 =124703839845238 All the operations are addition so all the addition can happen in one step.
12345 by 6789 ft squared
All of them.
12345 + 12345 = 24690
333 + 6789 = 7,122
12345 + 54321 = 66,666
12345 + 2 = 12347
0.9134
352,134
12345+6789=19134
False
12345
90000019888