EXPRESSION AND FORMULA

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Across
  1. 3. to make a expression easier
  2. 4. used in subtractions
  3. 8. shows if a number is negative
  4. 11. same variables to the same power
  5. 13. used to show the value of an expression
  6. 15. shows if a number is positive
  7. 17. plus, minus, divided multiplied
  8. 19. a figure or symbol denoting a number
Down
  1. 1. used in addictions
  2. 2. subtraction, indices, addition, division, Brackets, multiplication
  3. 5. to substitute a number by a letter
  4. 6. the number before a letter
  5. 7. number or decimal on it's own, without any letters
  6. 9. does not have an equal sign
  7. 10. has an equal sign
  8. 12. operation operation that undo each other
  9. 14. tells you how many times you have to multiply a number by it's self
  10. 16. the letter after a number
  11. 18. number or letter in a mathematical expression