The Real Number System

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Across
  1. 2. An undefined number is the result of dividing by...
  2. 5. All natural numbers including zero
  3. 6. The square root of a negative number
  4. 7. A rational number is a number that can be written as a...
Down
  1. 1. A decimal that ends
  2. 3. The cube root of 37 lies between two numbers, what is the smallest of these two numbers?
  3. 4. The dividend located above the fraction bar