The main operations

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Across
  1. 2. ...multiplied by...
  2. 7. Not exact, but close enough to be used / To estimate.
  3. 8. The third power of a quantity.
  4. 9. Symbols used in pairs to group things together / Parenthesis.
Down
  1. 1. To use the rules of arithmetic and algebra to rewrite an expression to make it make less complex or complicated.
  2. 3. A number to the 2nd power.
  3. 4. When we remove the ( ).
  4. 5. ...divided by...
  5. 6. To work out an answer, usually by adding, multiplying etc.