A group of students is painting a background piece for a school play what is the area of the part that is painted grey?

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

Think of it as five or above give it a shove. change the 5 or above to the right to a zero and add one to the number on the left.