maths crossword

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Across
  1. 4. this symbal means what: x (eg 5x5)
  2. 6. this symbal means what: 5/5
  3. 7. is a whole number
  4. 8. this symbal means what: ÷ (eg 5÷5
Down
  1. 1. is the outside of a shape
  2. 2. this symbal means what: + (eg 5+5)
  3. 3. this symbal means what: - (eg 5-5)
  4. 5. is the size of a surface