There are infinitely many possible answers. Some possibilities are:
1*780
100*7.8
2.5*312
15 times 52 equals 780.
Multiply 780 times .15 The answer is 117
780/65=12
51 goes into 780 15 times with remainder 15.
130
780
4,680
2340.
It is 780
Ten times.
3,120
6.5 x 12 = 78