Decimal addition and subtraction

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12345678910111213
Across
  1. 1. 3.8+8.7
  2. 5. 23.61+31.17
  3. 7. 13.34+14.23
  4. 8. 31.12-104.96
  5. 11. 432.51+424.09
  6. 12. 123.4+253.1
  7. 13. 946.43-312.11
Down
  1. 2. 407.86-173.10
  2. 3. 9599.9-2125.2
  3. 4. 31.3+34.4
  4. 6. 341.416-989.979
  5. 9. 96.99-64.31
  6. 10. 31.34+53.40