This document outlines a math lesson on representing fractions as parts of a whole on a number line. The lesson includes fluency practice identifying fractions, an application problem involving spending parts of money, and three concept development problems decomposing fractions like 1/4 and 1/5 using number bonds. Students work in pairs on the concept problems and compare their number bonds to a sprint worksheet. The lesson concludes with a problem set, debrief, and exit ticket to assess understanding.