The Skills list explicitly includes making line plots with fractional units and solving addition/subtraction of fractions using line plots. Student activities require students to create and interpret line plots with quarters and eighths (Creating a Line Plot with weights in 1/4-pound increments; Line Plots With Fractions and the pizza contest with 1/8 increments). Worksheets ask students to compute totals (e.g., total length of insects at 1.5 cm; total weight of rabbits at 2 1/4 lb) and differences (e.g., difference between heaviest and lightest rabbit = 1 3/4 lb; difference in insect group lengths).