HE+HT, HE-HT, HE+HE, HE-HE, HE+TE, HE-TE, HE+HTE, HE-HTE

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Across
  1. 1. 208 + 46 =
  2. 3. 506 + 470 =
  3. 5. 803 - 536 =
  4. 7. 602 - 470 =
  5. 9. 507 - 32 =
  6. 11. 904 - 468 =
  7. 13. 708 - 320 =
  8. 16. 807 + 53 =
  9. 17. 302 + 604 =
  10. 18. 301 - 78 =
Down
  1. 2. 89 + 507 =
  2. 4. 605 + 107 =
  3. 6. 507 + 208 =
  4. 8. 605 - 312 =
  5. 10. 606 + 182 =
  6. 11. 206 + 257 =
  7. 12. 430 + 208 =
  8. 13. 303 + 67 =
  9. 14. 708 - 506 =
  10. 15. 402 - 209 =