if 4 is the remainder when m is divided by 10 , what is the remainder when 4 m is divided by 10 ?
"we can put m = 10 * k + 4 . so 4 * m = 40 * k + 16 - - - > 40 * k + 16 = 10 * ( 4 * m + 1 ) + 6 - - - > the remainder is 6 . the answer is , therefore , ( c ) ."
reminder(10, 4)