820 - 475?
345
750 - 625?
432 + 168?
600
150 + 250?
400
670 - 345?
325
275 + 125?
400
800 - 467?
333
234 + 156?
390
123 + 456?
579
310 + 190?
500
499 + 401?
900
512 - 248?
264
643 - 289?
354
389 + 211?
600
600 - 299?
301