Lesson Plan : Mixed Num/ Impr Frac/+or- unlike
Teacher Name: | Sue Maier |
Grade: | Grade 5 |
Subject: | Math |
Topic: | Mixed Numbers, Improper Fractions, and their use in adding and subtracting unlike fractions |
Content: | mixed numbers and their relationship to improper fractions and vice versa, conversion to improper fractions ncessary for adding and subtracting fractions with like denominators Vocab: mixed number, improper fraction, like denominators, numerator, denominator, convert |
Goals: | The student will be able to change mixed numbers into improper fraction, complete addition or subtraction with those improper fractions, and convert the answer back into a mixed number. |
Objectives: | TLW demonstrate understanding of the conversion of mixed numbers to improper fractions for use in the add/subt of fractions with like denominators and then converting the answer back into a mixed number by completing a written exercise that requires he/she to convert and apply the conversion to the operation shown. |
Materials: | sets of fraction "pie pieces" (enough for more than two wholes), pencils, paper, whiteboard and markers, printed exercise pages |
Introduction: | Ask the students to do mental math to get the answer to a story problem about how many tubs of ice cream the students had eaten on field day (subtracted from a whole) for the purpose of finding out how much ice cream is left for the last day of school party. |
Development: | Model the verbal story problem from above with fraction pieces to show the starting wholes. Write the starting mixed number on the board. Ask the students to count the total number of pieces shown on the table. Write that amount as an improper fraction next to the mixed number. Point out the equality of the two different expressions. Model the rest of the verbal story problem, subtracting correct amount of pieces. Have students count remaining pieces and write as an improper fraction. Then have them count the wholes and leftovers, and write that amount as a mixed number. Model how it use multiplication and addition to convert a mixed number to an improper fraction. Have students practice on individual papers and have neighbors check each others work for accuracy. Have students tell each other the process for the conversion and how to use the info to add or subt. |
Practice: | Have students write problems to solve for each other, reminding them to start with a larger mixed number than the one they are subtracting! Students swap and do the other's problem. They check each other for accuracy. Repeat process while swapping with a different student. Give students preprinted exercises. Do the first one together and have students tell each step as it is done. Do #'s 2 4 together, checking for accuracy each problem. |
Accommodations: | Exercises with figures to color in properly are available. Fraction piece sets can be used to illustrate conversion between forms and for add/subt. Students can write their own story problems and solve themselves, or change with a colleague and complete. |
Checking For Understanding: | Teacher checks papers as students complete them. Corrections are made and re-instruction occurs if mastery is not demonstrated. |
Closure: | Teacher re-states the days subject and goal, quickly states the steps practiced, and verbalizes the application of targeted learning. |
Evaluation: | Teacher can evaluate accuracy of independent practices, verbally "quiz" students individually on the process they just learned, allow students to "be the teacher" and review steps needed to perform said operation. |
Teacher Reflections: | Evidence of student mastery will be evaluated, and plan for continued instruction in Math adjusted to allow for student needs. |
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