9-8 = 1/98 = 1/43046721
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8-9 = 1/89 = 0.000000007451 (rounded)
8.0 × 10-9 written in regular notation is: 0.0000000080
1/9 = 0.11111...
-9 x -8 = +72 negative x negative = positive
2/9 minus (negative 8/9) = 2/9 + 8/9 = 10/9