Maths

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Across
  1. 5. A value that can never be negative
  2. 6. Method of seperating numbers name after a Greek mathematician
  3. 7. Used to treat an expression as a single number
Down
  1. 1. Two word name , was used after names of kings and queens
  2. 2. 4+3 = 7 and 3+4 = 7
  3. 3. numbers divisible by the only even prime number
  4. 4. Used for a unknown number that does not have a fixed quantity