math

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12345678910
Across
  1. 5. i=1
  2. 7. sum
  3. 9. only can divide 1 into it
  4. 10. subject
Down
  1. 1. the higher number less the lower number
  2. 2. 1+(9-8)
  3. 3. one over five
  4. 4. add
  5. 6. 90degrees
  6. 8. singel number