Unit Fractions . A common misunderstanding relating to fractions for students to consider them as they do whole numbers and when they focus on the denominator which names the fraction, they believe that larger denominators mean larger fractions e.g. quarters are larger than thirds because 4 is larger than 3. . This misunderstanding indicates students are not considering the fraction but just the numbers that form the fraction. Fractions are a division situation and all division (and subtraction)