Rounding Off Numbers
Find a 9-digit number, which you will gradually round off starting with units, then tenth, hundred etc., until you get to the last numeral, which you do not round off. The rounding alternates (up, down, up …). After rounding off 8 times, the final number is 500000000. The original number is commensurable by 6 and 7, all the numbers from 1 to 9 are used, and after rounding four times the sum of the not rounded numerals equals 24.
There are a lot of solutions! for eample :
471392586 >> 471392590 > 471392600 > 471393000 > 471390000 > 471400000 > 471000000 > 470000000 > 500000000
after 4 steps the sum of digits of 47139 is 24
493712856…
517294386 > 517294390 > 517294400 > 517294000 > 517290000 > 517300000 > 517000000 > 520000000 > 500000000
after 4 steps the sum of digits of 51729 is 24
Your Answer
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