Addition and Subtraction with Fractions
Intended Audience
5th Grade Students
Student will understand:
-That estimation can be used to determine the reasonableness of an answer
-The effects of operations for adding and subtracting fractions are the same as those with whole numbers (Example: adding two positive fractions results in a sum greater than either of the fractions).
-Combining or separating like-sized parts can make it easier to add and subtract parts such as fractions. (Example: combining eighths with eighths is easier than combining eighths with sevenths)
-Fractions with unlike denominators can be renamed as equivalent fractions with like -Denominators to create like-sized parts for adding and subtracting.
-Interpreting and modeling a word problem involving fractions requires finding out whether the fractions refer to the same whole.
Outline
Equivalent Fractions
Lesson 1: Make equivalent fractions with the number line, the area
model, and numbers.
Lesson 2: Make equivalent fractions with sums of fractions with like
denominators.
Making Like Units Pictorially
Lesson 3: Add fractions with unlike units using the strategy of creating
equivalent fractions.
Lesson 4: Add fractions with sums between 1 and 2.
Lesson 5: Subtract fractions with unlike units using the strategy of
creating equivalent fractions.
Lesson 6: Subtract fractions from numbers between 1 and 2.
Lesson 7: Solve two-step word problems.
Making Like Units Numerically
Lesson 8: Add fractions to and subtract fractions from whole numbers
using equivalence and the number line as strategies.
Lesson 9: Add fractions making like units numerically.
Lesson 10: Add fractions with sums greater than 2.
Lesson 11: Subtract fractions making like units numerically.
Lesson 12: Subtract fractions greater than or equal to 1.
Description of Project
Standards & Competencies
Jefferson County CCAP Documents
ISTE Standards
Supporting Materials
Mega Math
Fraction Games
IXL Math
You Tube Videos