7th grade readiness challenge for math

12345678
Across
  1. 3. A number that has more than one pair of factors.
  2. 6. smallest positive integer that is divisible by both a and b.
  3. 7. Everything stays the same.
  4. 8. A set of real numbers between two given numbers.
Down
  1. 1. A number that cannot be simplified any more.
  2. 2. The difference of a positive or negative number.
  3. 4. Use most often to compare two numbers on a number line.
  4. 5. The greatest factor that all of the factors share.