Maths crossword

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Across
  1. 3. a number on its own
  2. 5. a statement that the values of two mathematical expressions are equal (indicated by the sign =).
  3. 7. above zero
  4. 8. shorter version of mathmatics.
Down
  1. 1. the part of maths in which letters and other symbols are used.
  2. 2. is the result of multiplying, or an expression that identifies factors to be multiplied
  3. 4. below zero
  4. 6. to divide
  5. 9. 2+2=4