math puzzle

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Across
  1. 1. a number with a dot on the left side of the dot is a whole number
  2. 4. a number that has exactly two unique factors one and itself
  3. 7. a number under 0
  4. 9. a problem with a greater than or less than symbol and a variable
Down
  1. 2. a number with more than 2 factors
  2. 3. a number above o
  3. 5. a letter used for an unknown number
  4. 6. when you put 2 numbers together and get a bigger number
  5. 8. a tool to put multiple numbers on to see the difference in certain things
  6. 10. the set of whole number and their opposites