Students develop understanding of division of fractions by fractions and operations on whole numbers and decimals, including addition, subtraction, multiplication, and division.
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Create a diagram and a multiplication or division equation to represent the relationship in situations involving equal-size groups, and coordinate these representations.
Interpret a division expression in two ways: as an answer to a “How many groups?” question or to a “How many in each group?” question.
Lessons
Size of Divisor and Size of Quotient
Meanings of Division
B Dividing Fractions · 6 lessons
Goals
Generalize a process for dividing a number by a fraction.
Lessons
How Many Groups?
What Fraction of a Group?
How Much in Each Group? (Part 1)
How Much in Each Group? (Part 2) (Optional)
Finding an Algorithm for Dividing Fractions
Ratios and Rates with Fractions
C Fractions in Lengths, Areas, and Volumes · 4 lessons
Goals
Determine the volume of a rectangular prism by packing it with unit cubes with appropriate unit-fraction edge lengths and by multiplying the edge lengths.
Solve problems about length comparison, the side lengths and area of a rectangle, and the edge lengths and volume of a rectangular prism using fraction division.
Lessons
Fractional Lengths
Rectangles and Triangles with Fractional Lengths
Volume of Prisms
Solving Problems Involving Fractions (Optional)
D Adding, Subtracting, and Multiplying Decimals · 5 lessons
Goals
Calculate the product of two decimals and explain the solution method.
Explain the sum or difference of two decimals in terms of combining like base-ten units and composing (or decomposing) a larger unit from (or into 10) units of a lower value.
Use the standard algorithm to add or subtract decimals with multiple non-zero digits.
Lessons
Using Decimals in a Shopping Context
Using Diagrams to Represent Addition and Subtraction
Adding and Subtracting Decimals with Many Non-Zero Digits
Methods for Multiplying Decimals
Calculating Products of Decimals
E Dividing Decimals · 4 lessons
Goals
Calculate the quotient of a whole-number or a decimal dividend and a decimal divisor, and explain the solution method.
Use long division to divide a multi-digit whole number or a decimal by a whole number.