Work out 2-1/3 and 2+1/3 separately as improper fractions: 2-1/3=2/1-1/3. An improper fraction is one where the top (numerator) is bigger than the bottom (denominator). The common denominator is 3. 1 into 3 goes 3 multiplied by 2=6. So 2-1/3 is (6-1)/3. The brackets mean do this calculation first. So we have 5/3. Now for 2+1/3. This is the same as (6+1)/3=7/3. So we have 5/3 divided by 7/3. In words this is five thirds divided by seven thirds. Five somethings divided by seven of the same somethings is 5/7. Or we can write 5/3 * 3/7 because a fraction is inverted when it's underneath the bar that separates the top from the bottom of the fraction. The 3's cancel out and we're left with 5/7.