1.25%0.5 mean

1.25 % 0.5 => remainder obtained when 1.25 is divided by 0.5 => 0.25

it's the remainder of a division so 1.25 = 2 * 0.5 + 0.25 https://www.google.pl/url?sa=t&source=web&rct=j&url=https://stackoverflow.com/questions/2664301/how-does-modulus-divison-work&ved=0ahUKEwj_4_rjsbvYAhXMAJoKHWPlBqwQjjgIJDAA&usg=AOvVaw0bI7kMKKq0jOCptf8uRVVr

This operator "%" gives reminder . So, 1.25%0.5 gives reminder 0.25