309
294
294
294
-294
99 + 98 + 97 = 294
15
It equals 285
95 plus 52 plus 95 plus 52 equals 294.
9 + 11 = 20... 19 - 4 = 15... 15 x 20 = 300... 300 - 6 = 294 !
15 x 6 or the long way is 90
n plus 15.n plus 15.n plus 15.n plus 15.
294. To do this quickly, the "trick" is to recognise that 12 + 88 = 100 Then using the laws of commutativity and associativity, 12 + 194 + 88 = 194 + 12 + 88 = 194 + (12 + 88) = 194 + 100 = 294