81 = 92
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81% means, = 81/100 -----------------------the simplest form
In index form, 90 can be expressed as 9^2. This is because the index form represents the number as a base raised to a power, where the base is 9 and the power is 2. This is equivalent to 9 * 9, which equals 81.
81+0=81
5,200 in standard index form = 5.2 × 103
2/3 is the simplest form of 54/81.