209 and 3/100 is 209.03 as a decimal and in standard form it is 2.0903*10^2
209.03
209.03
209/100 as a decimal is 2.09
209 hundredths = 209/100 = 2.09
2.09
209.03
209 + 300 = 509
There is no such thing as "decimalsths"
0.418
0.418 is a fraction. It is a fraction in decimal form rather than in the form of a ratio. However, that does not stop it being a fraction. And, being a decimal fraction, it is in its simplest [decimal] form. Its equivalent, in rational form, is 418/1000 which simplifies to 209/500.
209/100 as a decimal is 2.09