-214.0
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11010110 = 214
To convert -0.9 into a decimal, you simply write it as -0.9. There is no need to further convert it into a decimal form since it already is a decimal number. The negative sign indicates that it is a negative decimal number.
2.14 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. Its equivalent, in rational form, is 214/100. You can simplify this rational fraction if you require.
-2
A negative decimal plus a negative decimal equals a more negative decimal