How do you write two hundred and three thousandths in number form

-- "Two hundred and three thousandths" means' ' 2.003 '.

-- "Two hundred three thousandths" would mean ' 0.203 '.

How can you tell the difference?

The difference is the 'and'.  "And" means 'decimal point'.

' 678 ' is read as "six hundred seventy eight", with no 'and'.

' 40.06 ' is read as 'forty and six hundredths'.

' 0.46 ' is read as ' forty-six hundredths'.

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