Maths Mayhem!

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Across
  1. 4. The distance around a two dimensional shape
  2. 7. The bottom number in a fraction
  3. 9. A number that can not be made by multiplying other whole numbers
  4. 11. Has the same value
Down
  1. 1. Represents more than a whole in a fraction
  2. 2. A four sided shape
  3. 3. A factor that is a prime number
  4. 5. The top number in a fraction
  5. 6. A whole number
  6. 8. The size of a surface
  7. 10. What we get after multiplying a number by an integer