Is there an easier way to learn fractions

Ahmed plans to add a rectangular sunroom to his house. the sunroom will have a length of 14 feet and a width of 10 feet, and the construction will cost $40 per square foot. how much more would the sunroom cost if it’s width were increased to 12 feet?

Round the number to the hundredths place. 26,379.87492 a. 26,379.87 b. 26,379.88 c. 26,380 d. 26,400

Find the circumference of the circle (use 3.14 for pi)show your work.round to the nearest tenth.