How can units help you solve a problem?

What numbers are divisible by 20? The meaning of rope vs line? Why were arches used? Where is eaths circumference greatest? What does OHG four times a day mean? What does the math term repeating decimals mean? What equals 68 in times? How do you multiply 42 x 8 by breaking apart numbers? Calculate the surface area volume and ratio of surface area to volume of an imaginary cubic cell measuring 5 mm on each side? What are lemons shaped like? What are the positive factors of 30? What is 2.9 percent 0f 150? What is the sum of the interior angles of a polygon with 19 sides? The number of times a wave repeats itself is called? Six is three percent of what number? Which digit is in the thousandths place in the number 98.765? When does an even number of odd numbers equal an odd number? 99 times 8? Are 14 and 18 prime numbers? How many years is it from 1994 to 2012?