As students observe what is happening in this file, help them focus on how subtraction is represented on the number line.
What to look for
Have students illustrate the subtraction on number lines they have drawn. Then have them model the subtraction on the interactive number lines.
In how many ways can you decompose (5/4) into the sum of two fractions with a denominator of 4?
Answer: (1/4)+(4/4); (2/4)+(3/4); (0/4)+(5/4).