Maths project- Crossword puzzle

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Across
  1. 2. A whole number that can be divided evenly by numbers other than 1 or itself
  2. 4. A quantity which during a calculation is assumed to vary in value
  3. 6. The mathematician who gave the first correct proof of the ‘Fundamental theorem of arithmetic’
  4. 8. Abbreviation of Highest Common Factor
  5. 9. 0.4495 is a ____ decimal
  6. 11. A natural number greater than 1 that has no positive divisors other than 1 and itself
  7. 13. Two or more lines that meet at a point
  8. 14. 2x -7y + 35 = 56 is an example of a ______ equation in two variables
  9. 15. A positive integer that is equal to the sum of its proper positive divisors
  10. 16. Real numbers that cannot be written as a simple fraction
Down
  1. 1. Real numbers that can be written as a fraction
  2. 2. Two lines or shapes that lie exactly on top of each other
  3. 3. The branch of mathematics dealing with the properties and manipulation of numbers
  4. 5. Proven statement used for proving another statement
  5. 7. The resolution of an entity into factors such that when multiplied together they give the original entity
  6. 10. A equation of degree 2
  7. 12. The smallest positive number that is a multiple of two or more numbers
  8. 17. The decimal expansion of every rational number can either be terminating or non-terminating _______
  9. 18. If the lines of two linear equations are consistent, then they have ______ solutions
  10. 19. A series of well defined steps