Addition/subtraction puzzle

Edit Answers
12345678910111213
Across
  1. 3. 14862+25356
  2. 4. 5459+8310
  3. 6. 6924+4321
  4. 8. 2321-1217
  5. 10. 8972+2785
  6. 11. 8213-7505
  7. 12. 7985-1583
  8. 13. 1357-1289
Down
  1. 1. 8910+1098
  2. 2. 2312+2121
  3. 4. 76543+34567
  4. 5. 2341+7654
  5. 7. 8792-3951
  6. 9. 2345+5432
  7. 10. 8765+9642
  8. 12. 8539-2156