Easy Multiplication

Ekadhikena Purvena

 By this rule we can calculate

a) square of a number ending with 5:

for e.g.

 

            〖65〗^2                         〖 195〗^2

              = 6x7/5x5                            = 19x20/5x5

              = 42/25                                =380/25

              =4225                                   =38025

(b)Multiply numbers having unit digits adding up to 10 & rest of digits same

       189                            164 
    ×181                          × 166
-------------------------------------------18x19/9x1              16x17/6x4 

    =34209                      =27224