In percent form, two-thirds is 66.67 percent. To determine this, one divides two by three with a calculator to find 0.66666. To find this fraction in percent form, one has to multiply 0.66666 by 100 to find the answer 66.666 percent, which can be rounded 66.666 to the nearest hundredth to arrive at 66.67 percent.
If a given fraction has a denominator that one can multiply by another number that gives 100 in the denominator, then this is another method of finding a fraction in percent form. An example of this type of problem is the fraction one-half, or 1/2. One can multiply the numerator and denominator by 50 to get the answer 50/100. This fraction is equal to 0.50 percent. If one multiplies this by 100, one finds the answer 50 percent. In math, 50/100 is an equivalent fraction of 1/2.