Georgia 4.NR.4.6
The Standard
Add and subtract fractions and mixed numbers with like denominators using a variety of tools.
Georgia's K-12 Mathematics Standards · Solve real-life problems involving addition, subtraction, equivalence, and comparison of fractions with denominators of 2, 3, 4, 5, 6, 8, 10, 12, and 100 using part-whole strategies and visual models.
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students combine and separate fractions or mixed numbers when the parts are the same size. They represent their work with tools such as fraction strips, number lines, drawings, or equations.
What Mastery Looks Like
- Students accurately solve problems with fractions or mixed numbers that share a denominator. They use fraction strips, number lines, or drawings to show the calculation. They can explain why the denominator stays the same and when a whole must be traded.
Common Misconceptions
- Students may add or subtract the denominators along with the numerators. They may forget to trade one whole for fractional parts when subtracting mixed numbers. Some leave improper fractions unchanged without checking whether a mixed-number form is expected.
How to Assess It
- Exit ticket: Solve 4 2/5 minus 1 4/5. Draw a fraction model and write one sentence explaining any trade you made.
Lesson moves
Ways to Teach It
Give pairs fraction strips to model 2 3/4 minus 1 1/4, then record matching equations and explain each step.
Ask, "Why does the denominator stay the same when adding fourths?" Students write two sentences and sketch a model.
Play Fraction Target: students draw like-denominator cards, add or subtract them, and earn a point for landing closest to three.
Have students find how much ribbon remains from 5 3/8 yards after using 2 6/8 yards, using a number line.
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Printable 4.NR.4.6 Worksheet
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Related Standards
- 5.NR.3.3
Model and solve problems involving addition and subtraction of fractions and mixed numbers with unlike denominators.
- 5.NR.3.2
Compare and order up to three fractions with different numerators and/or different denominators by flexibly using a variety of tools and strategies.
- 6.NR.1.1
Fluently add and subtract any combination of fractions to solve problems.
- 4.NR.4
Solve real-life problems involving addition, subtraction, equivalence, and comparison of fractions with denominators of 2, 3, 4, 5, 6, 8, 10, 12, and 100 using ...
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