8.09 × 10^{-4} = 0.000809
8.09 × 10^{-5} = 0.0000809
8.9 × 10^{-4} = 0.00089
8.5 × 10^{-5} = 0.000085
8.5 × 10^{-4} = 0.00085
8.9 × 10^{-5} = 0.000089
8.5 × 10^{-6} = 0.0000085
8.59 × 10^{-4} = 0.000859
8.95 × 10^{-6} = 0.00000895
8.99 × 10^{-6} = 0.00000899
There are more activities on the more general topic of Indices and some particularly useful links can be found below:
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Level 1 - Five numbers to sort, all with positive powers of 10
Level 2 - Ten numbers to sort, all with positive powers of 10
Level 3 - Ten numbers to sort, all with negative powers of 10
Level 4 - Ten mixed numbers to sort, all greater than 1
Level 5 - Ten mixed numbers to sort, all less than 1