Maths project- Crossword puzzle

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