decimal fraction and rational number

12345678
Across
  1. 4. which fraction is this 2 5/3
  2. 6. (-)+(-)=
  3. 7. |-5|+|-20|
  4. 8. 1/0 is a rational number?
Down
  1. 1. which property is used when 6(5+1)=6*5+6*1
  2. 2. evry integer is a
  3. 3. which term is used when5/7 = 7/5
  4. 5. 5__7=35 which sign would be used here