I'm not sure what you're asking. You could spell it out as a word: twelve. In hexidecimal (base sixteen) it is C. You could say a dozen. You could say [10 + 2] or [3 x 4] or 60/5, etc.
12% or 12/100
The only other way really is -17+29.
You can 0.12 as 12/100 (simplify) and 12%.
12, A dozen add more please
12/10019/100
Two other ways to write 5.9 over 100 are: 59 over 1000 and 0.059
12 12*1 -1*-12 4*3 6*2
2 2
Ways to write one billion is: one billion,1 billion,1,000,000,000,you can write it in roman numeral several different ways,with tally marks, etc.
0.79 or 79/100
42993.8m 4299380cm
37%; 0.37