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12345678 + 12345678 = 2*12345678 = 12345678/5 *10 = 246,913,578
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The first ten positive integer multiples of 12345678 are: 1 x 12345678 = 12345678 2 x 12345678 = 24691356 3 x 12345678 = 37037034 4 x 12345678 = 49382712 5 x 12345678 = 61728390 6 x 12345678 = 74074068 7 x 12345678 = 86419746 8 x 12345678 = 98765424 9 x 12345678 = 111111102 10 x 12345678 = 123456780
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.
87,000,000 +600,000+50,000+4000+300+20+1