How do you do triplets in Sibelius?
Type CTRL+n, where n is the desired number of notes while you have a note selected. For example, to create a quaver triplet, create the first quaver, type CTRL+3 and then input the remaining notes.
How do you write fractions in Sibelius?
On the PC, you should be able to type the most common fractions directly into either Sibelius 7 or later or Finale 2012 or later using ALT codes. Hold down the ALT key, type 0188 on the numeric keypad, and then release the ALT key to insert the symbol ¼. To insert the symbol ½, use the character code 0189.