How do you do a thired on a calclator?

What percent is equal to 1 over 20? How many yards of concrete will it take to cover an 80 square feet at 4 inches thick? What two numbers add to -3 and have a product of -18? What number is half between 1450 and 2900? What is 5.3 inches? What is the largest common factor of 70 196? What is 5 divided by 214? What is a fifth and a tenth? Do you need a common denominator when adding subtracting multiplying or dividing? Which container would you choose to hold 50 thousand pennies? Is every number a rational number? What is 10.7 as a decimal? What is 2 and a half percent of 3? What is 3.64 divided by 0.8? A garden is 15meter long and 10 meter wide how many 1meter paving slabs would you need? You are out on a hike and you notice that the line of telephone wires you have been following along a slope is crooked. Two of the posts are much farther down slope then the others. What has likely oc? What is the last four digits of 21157? What the answer of 94-49 equals 55? What causes dispersion? What is 0.27083 as a fraction?