7th grade readiness challenge for math

123456
Across
  1. 1. The difference of a positive or negative number.
  2. 3. A number that has more than one pair of factors.
  3. 5. Use most often to compare two numbers on a number line.
  4. 6. Everything stays the same.
Down
  1. 2. A set of real numbers between two given numbers.
  2. 4. A number that cannot be simplified any more.