Solve the Unknown: A Math Crossword Puzzle

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Across
  1. 2. A symbol (usually a letter) that represents an unknown number or quantity.
  2. 4. The result of multiplying two or more numbers together.
  3. 5. Any number that cannot be expressed as a simple fraction.
  4. 7. A shape with 4 sides that are the same length.
  5. 10. The number being multiplied in an exponent.
  6. 11. The result of dividing one quantity by another.
  7. 15. The amount left over after dividing one number (the dividend) by another (the divisor).
  8. 18. The inverse operation of multiplication.
  9. 19. The total result obtained by adding two or more numbers.
  10. 20. The sum of all the sides of a shape; the boundary of the shape.
  11. 22. Numbers to the right of 0 on a number line.
  12. 23. A shape with 3 sides.
  13. 25. A number with the same magnitude but different sign.
  14. 26. The number that is being divided into equal parts by another number.
  15. 27. The parts of an expression that are added or subtracted.
  16. 29. The number that multiplies a variable, indicating how many of that variable you have.
  17. 30. Any non-negative integer (0, 1, 2, ...)
Down
  1. 1. The inverse operation of division.
  2. 3. A value that remains fixed and does not change.
  3. 6. The class you will take in eighth grade.
  4. 8. The inverse operation of addition.
  5. 9. The number that divides another number into equal parts.
  6. 12. A small number written to indicate repeated multiplication.
  7. 13. The number below the line in a fraction.
  8. 14. The number above the line in a fraction.
  9. 16. The result of subtracting one number from another.
  10. 17. Numbers to the left of 0 on a number line.
  11. 21. Any whole number that can be positive, negative, or zero, without any fractional or decimal parts (-3, -2, ... , 2, 3).
  12. 22. An acronym for the Order of Operations.
  13. 24. The inverse operation of subtraction.
  14. 28. A number that can be found on the number line, encompassing all rational numbers (fractions, terminating/repeating decimals, and irrational numbers).