To write 24.3 million in standard form, you would move the decimal point 6 places to the right to account for the "million" suffix. This would give you 24,300,000. In scientific notation, this would be written as 2.43 x 10^7.
243
3 to the 5th power (35) in standard form is 243
365,243
3 x 3 x 3 x 3 x 3 = 243
243/250
5/9
5 over 9
243 = 35
35 = 243
You can just type this into a calculator to find the answer -- it's just 3x3x3x3x3=243
243% = 2.43
117/243 in simplest form is 13/27.