Here in the US, we're not sure what "by" means. We think it means either
multiplication or division.
0.9 x 100 = 90
0.9 / 100 = 0.009
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9
nought point nought one seven or seventeen one thousandths
5
One hundred and sixty seven and nine thousandths or one hundred and sixty seven point zero zero nine.
Either: zero point nine one seven or nine hundred and seventeen thousandths