In words, 6.23 would be six and twenty-three hundredths.
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-81 + 623 = 542
2/7 of 623 is 178
There are infinitely many answers, including 1*623, 10*62.3, 100*6.23 (-1)*(-623) etc
Add 407 to 623 and you'll have your answer !... (It's more than a thousand !)
623 = (6 x 100) + (2 x 10) + (3 x 1)