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425 + 176 + 398 = 999
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537 + 268 + 194 = 999
537 + 294 + 168 = 999
537 + 298 + 164 = 999
538 + 164 + 297 = 999
538 + 167 + 294 = 999
538 + 194 + 267 = 999
538 + 197 + 264 = 999
538 + 264 + 197 = 999
538 + 267 + 194 = 999
538 + 294 + 167 = 999
538 + 297 + 164 = 999
539 + 174 + 286 = 999
539 + 176 + 284 = 999
539 + 184 + 276 = 999
539 + 186 + 274 = 999
539 + 274 + 186 = 999
539 + 276 + 184 = 999
539 + 284 + 176 = 999
539 + 286 + 174 = 999
543 + 167 + 289 = 999
543 + 169 + 287 = 999
543 + 187 + 269 = 999
543 + 189 + 267 = 999
543 + 267 + 189 = 999
543 + 269 + 187 = 999
543 + 287 + 169 = 999
543 + 289 + 167 = 999
547 + 163 + 289 = 999
547 + 169 + 283 = 999
547 + 183 + 269 = 999
547 + 189 + 263 = 999
547 + 263 + 189 = 999
547 + 269 + 183 = 999
547 + 283 + 169 = 999
547 + 289 + 163 = 999
549 + 163 + 287 = 999
549 + 167 + 283 = 999
549 + 183 + 267 = 999
549 + 187 + 263 = 999
549 + 263 + 187 = 999
549 + 267 + 183 = 999
549 + 283 + 167 = 999
549 + 287 + 163 = 999
563 + 147 + 289 = 999
563 + 149 + 287 = 999
563 + 187 + 249 = 999
563 + 189 + 247 = 999
563 + 247 + 189 = 999
563 + 249 + 187 = 999
563 + 287 + 149 = 999
563 + 289 + 147 = 999
564 + 137 + 298 = 999
564 + 138 + 297 = 999
564 + 197 + 238 = 999
564 + 198 + 237 = 999
564 + 237 + 198 = 999
564 + 238 + 197 = 999
564 + 297 + 138 = 999
564 + 298 + 137 = 999
567 + 134 + 298 = 999
567 + 138 + 294 = 999
567 + 143 + 289 = 999
567 + 149 + 283 = 999
567 + 183 + 249 = 999
567 + 189 + 243 = 999
567 + 194 + 238 = 999
567 + 198 + 234 = 999
567 + 234 + 198 = 999
567 + 238 + 194 = 999
567 + 243 + 189 = 999
567 + 249 + 183 = 999
567 + 283 + 149 = 999
567 + 289 + 143 = 999
567 + 294 + 138 = 999
567 + 298 + 134 = 999
568 + 134 + 297 = 999
568 + 137 + 294 = 999
568 + 194 + 237 = 999
568 + 197 + 234 = 999
568 + 234 + 197 = 999
568 + 237 + 194 = 999
568 + 294 + 137 = 999
568 + 297 + 134 = 999
569 + 143 + 287 = 999
569 + 147 + 283 = 999
569 + 183 + 247 = 999
569 + 187 + 243 = 999
569 + 243 + 187 = 999
569 + 247 + 183 = 999
569 + 283 + 147 = 999
569 + 287 + 143 = 999
574 + 136 + 289 = 999
574 + 139 + 286 = 999
574 + 186 + 239 = 999
574 + 189 + 236 = 999
574 + 236 + 189 = 999
574 + 239 + 186 = 999
574 + 286 + 139 = 999
574 + 289 + 136 = 999
576 + 134 + 289 = 999
576 + 139 + 284 = 999
576 + 184 + 239 = 999
576 + 189 + 234 = 999
576 + 234 + 189 = 999
576 + 239 + 184 = 999
576 + 284 + 139 = 999
576 + 289 + 134 = 999
579 + 134 + 286 = 999
579 + 136 + 284 = 999
579 + 184 + 236 = 999
579 + 186 + 234 = 999
579 + 234 + 186 = 999
579 + 236 + 184 = 999
579 + 284 + 136 = 999
579 + 286 + 134 = 999
583 + 147 + 269 = 999
583 + 149 + 267 = 999
583 + 167 + 249 = 999
583 + 169 + 247 = 999
583 + 247 + 169 = 999
583 + 249 + 167 = 999
583 + 267 + 149 = 999
583 + 269 + 147 = 999
584 + 136 + 279 = 999
584 + 139 + 276 = 999
584 + 176 + 239 = 999
584 + 179 + 236 = 999
584 + 236 + 179 = 999
584 + 239 + 176 = 999
584 + 276 + 139 = 999
584 + 279 + 136 = 999
586 + 134 + 279 = 999
586 + 139 + 274 = 999
586 + 174 + 239 = 999
586 + 179 + 234 = 999
586 + 234 + 179 = 999
586 + 239 + 174 = 999
586 + 274 + 139 = 999
586 + 279 + 134 = 999
587 + 143 + 269 = 999
587 + 149 + 263 = 999
587 + 163 + 249 = 999
587 + 169 + 243 = 999
587 + 243 + 169 = 999
587 + 249 + 163 = 999
587 + 263 + 149 = 999
587 + 269 + 143 = 999
589 + 134 + 276 = 999
589 + 136 + 274 = 999
589 + 143 + 267 = 999
589 + 147 + 263 = 999
589 + 163 + 247 = 999
589 + 167 + 243 = 999
589 + 174 + 236 = 999
589 + 176 + 234 = 999
589 + 234 + 176 = 999
589 + 236 + 174 = 999
589 + 243 + 167 = 999
589 + 247 + 163 = 999
589 + 263 + 147 = 999
589 + 267 + 143 = 999
589 + 274 + 136 = 999
589 + 276 + 134 = 999
594 + 137 + 268 = 999
594 + 138 + 267 = 999
594 + 167 + 238 = 999
594 + 168 + 237 = 999
594 + 237 + 168 = 999
594 + 238 + 167 = 999
594 + 267 + 138 = 999
594 + 268 + 137 = 999
597 + 134 + 268 = 999
597 + 138 + 264 = 999
597 + 164 + 238 = 999
597 + 168 + 234 = 999
597 + 234 + 168 = 999
597 + 238 + 164 = 999
597 + 264 + 138 = 999
597 + 268 + 134 = 999
598 + 134 + 267 = 999
598 + 137 + 264 = 999
598 + 164 + 237 = 999
598 + 167 + 234 = 999
598 + 234 + 167 = 999
598 + 237 + 164 = 999
598 + 264 + 137 = 999
598 + 267 + 134 = 999

There are 1080 ways to arrange the numbers one to nine to form three 3 digit numbers which add up to 999.