Decimals to pecents should be easy enough. You just move the decimal to the right two spaces. But if you want the long way, then you have to convert to a fraction first. then you divide or multiply it by a number so that you have a denominator (that's the one on the bottom) of 100. then you take the numerator (on top) and that's your pecent. Here are some examples of both ways:

1a).23=23%

1b)  .455=45.5%

2a) .23=23/100= 23%

2b) .0045= 45/10000=.45/100=.45%