• When one no has 0 in the last
  • 36 dividend by 6, 6 dividend by 3. Then 36 also divided by 3
  • When multiple by 9, 99, 999
  • When multiple by 1, 11, 111, 1111
  • When dicimal than,
  • Easy one
  • Rule with negative numbers
  • Multiplication
  • Some unique number