1358024679202224, as lining them up, you see the hole in between 9 and 1 replaced with a zero. Adding gets you 1358024679202224.
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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.
The answer is 672.
That is 27 x 9 = 243
189
A plus + a plus is a plus.