Lesson Plan: Subtracting Fractions from Mixed Numbers: Regrouping
This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to subtract a proper fraction from a mixed number, where their denominators are multiples of the same number, by partitioning the mixed number, regrouping a whole if necessary, and writing equivalent fractions.
Objectives
Students will be able to
- subtract a proper fraction from a mixed number when the denominator of one is a multiple of the denominator of the other,
- subtract proper fractions from mixed numbers when we have to regroup a whole,
- represent calculations with models including bar models,
- subtract by partitioning one of the mixed numbers,
- subtract by converting mixed numbers to improper fractions,
- understand why one method may be easier than the other.
Prerequisites
Students should already be familiar with
- subtracting fractions with the same denominator,
- finding equivalent fractions,
- writing fractions in simplest form,
- writing mixed numbers as improper fractions and improper fractions as mixed numbers.
Exclusions
Students will not cover
- finding the least common denominator.