Maths upside-down

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Across
  1. 3. = D
  2. 4. = E
  3. 5. = G
  4. 6. = K
  5. 7. = A
  6. 10. = I
  7. 11. = L
Down
  1. 1. = J
  2. 2. = B
  3. 3. = C
  4. 8. = F
  5. 9. = H