7.7 × 10^{6} = 7700000
7.57 × 10^{6} = 7570000
7.5 × 10^{7} = 75000000
7.07 × 10^{7} = 70700000
7.07 × 10^{6} = 7070000
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