Number spelling

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12345678910111213
Across
  1. 2. 10 - 8 =
  2. 3. 20 + 20 =
  3. 6. 20 - 17 =
  4. 7. 50 + 50 = one _ _ _ _ _ _ _
  5. 8. 3 x 5 =
  6. 11. 15 + 15 =
  7. 12. 20 - 6 =
  8. 13. 4 + 4 =
Down
  1. 1. 10 - 6 =
  2. 2. 6 + 6 =
  3. 4. 10 + 10 =
  4. 5. 20 - 3 =
  5. 9. 500 + 500 = one _ _ _ _ _ _ _ _
  6. 10. 11 + 8 =