0.9:1.3 = 0.9 * (): 1.3 * 10 = (:) number in brackets

0.9:1.3 = 0.9 * (): 1.3 * 10 = (:) number in brackets

0.9:1.3=0.9*(10 ):1.3*10=(9 :13)
Hope to help you