10-7 = 0.0000001
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10-2 = 0.01
It is 0.0000000861
6.35 x 10^-4 = 0.000635
-214.0
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.