Any transformation you make in Illustrator can be immediately reapplied to another object. If, as in this case, the transformation includes a copy, the copy command will also be reapplied.
With the newly created copy of the number 12 still selected, choose Transform > Transform Again to create a second copy.
You will notice next to the Transform Again command an indication of the keyboard shortcut: Control-D (or Command-D on a Mac). You can use this shortcut to create the remaining copies.
Once you have created all the copies, select the text tool and edit each of the copies, replacing the 12 with the appropriate number.
