500 minus 279 is 221.
500 minus 315 equals 185.
Half of 7000 is 3500 minus 500=3000.
The positive integer factors of 1147 are:1, 31, 37. 1147
1147 is composite.
8000-500=7500.
500 - 441 = 59
500 - 199 = 301
500 - 150 = 350
500 - 399 = 101
500 - 240 = 260
500 - 343 = 157