Not easy to do in your head. 210 = 1024, 29=512, so 229 will be 1024 * 1024 * 512. REALLY rough estimate is 1000 * 1000 * 500 = 5 with 8 zeros. 500,000,000.
My TI-84 Silver Edition tells me it is really 536,870,912.
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23*3 = 29 = 512
According to the laws of exponents, xy times xz = xy+z. Therefore, 27 x 22 = 2(7+2) = 29 = 512.
2% of 29= 2% * 29= 0.02 * 29= 0.58
When a number is raised to a power, it is itself multiplied together the power times, eg:22 = 2 x 223 = 2 x 2 x 2so:210 = 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2= 2 x (2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2)= 2 x 29= twice 29
29 (or 2^9) = 512(If you cannot see that the 9 is a superscript due to the formatting of the new style pages, that is 2^9 power or 2x2x2x2x2x2x2x2x2.)