Grade 3/Fractions
Subtracting Mixed Numbers (923)
Students practice subtracting mixed numbers with like denominators. This reinforces the understanding of mixed numbers as a combination of wholes and parts.
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Teaching Notes
Similar to addition, group Whole - Whole and Fraction - Fraction. Ensure the first fraction is larger than the second to avoid borrowing for now.
Vocabulary
Mixed Number: A whole number and a fraction together.
Like Denominators: Fractions with the same bottom number.
Common Mistakes
- Subtracting in wrong order.
- Subtracting denominators.
- Forgetting to subtract whole numbers
- Subtracting denominators
- Not simplifying fractions
- Ignoring the fraction part
Differentiation
SupportUse visual models.
ChallengeIntroduce borrowing (e.g., 3 1/4 - 1 3/4).
Discussion Questions
- What if the second fraction is bigger than the first?
- How do we check our answer?
- How is subtracting mixed numbers similar to subtracting whole numbers?
- Why is it important for the denominators to be the same?
- What does 'no borrowing needed' mean in this context?
- Can we represent mixed numbers in another way before subtracting?
Extension Activities
- Word problems.
- Distance difference problems.
Parent Tip
Ask your child to find the difference between 5 cookies and 1 1/2 cookies.
Learning Path
Skill Cluster
Fractions and Operations
Estimated Time
20 minutes
Skills Practiced
subtract mixed numbers
Prerequisites
- 922
- Understanding mixed numbers
- Subtracting fractions with like denominators
Next Steps
- Subtracting mixed numbers with regrouping
- Adding mixed numbers with like denominators
- Subtracting Mixed Numbers with Regrouping
- Subtracting Fractions with Unlike Denominators
- Adding Mixed Numbers with Like Denominators