First, determine what number is in the second decimal place. As it is a five in this case, the first decimal place is rounded up with the answer becoming 3.5.
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3.5
3500
3456 - 99999 = -96,543
Any terminating decimal is rational since it can be express as a fraction. Recurring decimals are also rational. E.g 3.456 = 3456/1000 or 4.555... = 41/9
3,456 multiplied by 3,456 is 11,943,936.
3456 in Roman numerals is MMMCDLVI