Given: 72020isdividedby5 ConceptUsed: For a number to be divisible by 5 it should end with either 0or5 Calculation: 71→Endswith7 72→Endswith9 73→Endswith3 74→Endswith1 75→Endswith7 Thelastdigitgetsrepeatedforevery
interval
cycle
of4 ⇒72020=left(74)505=(1)505→Endswith1 ∴therequiredremainderwhen72020 is divided by 5 is 1