Sharing and Grouping: Dividing Unit Fractions and Whole Numbers
A complete Grade 5 math lesson pack on dividing unit fractions and whole numbers: sharing ...
View Resource : Sharing and Grouping: Dividing Unit Fractions and Whole NumbersA complete Grade 5 math pack on mixed numbers and improper fractions. Students identify each type, convert improper fractions to mixed numbers by dividing (17/5 = 3 2/5), convert mixed numbers to improper fractions by multiplying and adding (2 3/4 = 11/4), compare them with 1 and solve real-life problems. Includes slides with worked examples, a lesson plan, worksheet, quiz, homework, flashcards, a rubric and answer keys.
A proper fraction is less than one whole, but some fractions are more than a whole. An improper fraction has a numerator greater than or equal to its denominator (7/4), and a mixed number shows the same amount as a whole number and a fraction (1 3/4). Students use fraction strips and pictures to see why 7/4 and 1 3/4 are equal. To change an improper fraction into a mixed number, they divide the numerator by the denominator: the quotient is the whole number and the remainder is the new numerator. To change a mixed number into an improper fraction, they multiply the whole number by the denominator and add the numerator. Students practice both conversions and use them in recipes, pizzas and measurements.
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Support: use fraction strips and denominators of 2, 3 and 4 only. Challenge: students compare mixed numbers and improper fractions (Which is greater: 11/4 or 2 1/2?) and place them on a number line.
Use the worksheet and quiz to check both conversions. Use the rubric to assess explanations and the homework problems.
Encourage students to check each conversion with a picture or by converting back. A common error is adding instead of multiplying (for 2 3/4, writing 5/4). Ask: How many quarters are in one whole? In two wholes?
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