8.5 × 10^{8} = 850000000
8.9 × 10^{7} = 89000000
8.09 × 10^{8} = 809000000
8.09 × 10^{7} = 80900000
8.59 × 10^{7} = 85900000
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