2.3 x 10^2
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40.000000 in standard index form is 4.0 × 101
8890 in standard index form = 8.89 × 103
No. In the index form a number is expressed as a multiple of its prime factors whereas in the standard form it is expressed as a number between in the range [1, 10) multiplied by an integer power of 10. So, for example, 1728 in index form = 26*33 1728 in standard form = 1.728*103 The index form can only be used for integers.
Oh, dude, writing 23 tens in standard form is like a walk in the park. You just multiply 23 by 10, and bam, you get 230. It's as simple as that. So, like, 23 tens in standard form is 230. Easy peasy.
4 x 10-1