#### Understanding

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.

### Sample Assessment

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).