What is 99.99 to 2 significant figures?

Answer 1

9,900 because the two signifcant figures are both 9's, likewise if it was to 3 sig. figs. then the answer would be 9,990.

Answer 2

100.

Interesting question, though, because that has only one significant figure.

You could indicate accuracy to 2 sig fig by using scientific notation: 1.0*102.

Answer 3

1.0 x 10^2

Answer 4

The answer is 10,000 not 9900 because it should be as close to the original number as possible and for numbers 5 and above you round up not down