Acarpet measuring 4m And 3 1/2m is placed on the floor of a room maesuring 4 1/2 and4m . Calculate area of the floor that is not carpeted

1. 0.3 •4 is the same as 4 groups of 0.32. 7•0.8 is the same as 7 groups of 0.83. it increases by 0.5 every time, so 0.5x4 it increases by 0.9 every time, so 0.9x5. 0.9•12=10.86. 0.47•5=2.35i can finish the next ones in a separate post

These are the multiples of 15 but what you are probably asking or what are the factors of 15