Numbers

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1234567
Across
  1. 3. thirteen (+) three =
  2. 4. Nine (-) seven =
  3. 5. twenty (-) one =
  4. 7. Seventeen (-) six =
Down
  1. 1. Five (+) eight =
  2. 2. fourteen (-) seven =
  3. 4. two (+) ten =
  4. 6. twelve (-) nine =