School crossword

123456
Across
  1. 3. Least ______ Factor
  2. 4. New Stone Age
  3. 5. _______ and negative numbers
  4. 6. What was discovered in the New Stone Age that was not discovered in the Old Stone Age
Down
  1. 1. Person, place or thing
  2. 2. Direct and ____ object
  3. 5. Old Stone Age