Objective

Students will learn to divide fractions and mixed numbers accurately by applying the "Keep, Change, Flip" method, meeting the Common Core standard 6.NS.A.1:

• Interpret and compute quotients of fractions, and solve word problems involving division of fractions by fractions.

Standards Alignment

• CCSS.MATH.CONTENT.6.NS.A.1: Interpret and compute quotients of fractions (including mixed numbers) and solve related word problems.
• CCSS.MATH.PRACTICE.MP3: Construct viable arguments and critique the reasoning of others.
• CCSS.MATH.PRACTICE.MP7: Look for and make use of structure.

Materials

• Whiteboard and marker or digital board
• Fraction tiles or printed fraction models
• Student mini whiteboards and markers
• Stopwatch or timer
• Pre-prepared fraction division problems on cards

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Minute Breakdown

0:00-0:20 — Engage & Activate Prior Knowledge

• Prompt: “Who can remind us how to multiply fractions quickly and why? What do you think happens when dividing fractions?”
• Use fraction tiles to show a simple multiplication of fractions (e.g. 1/2 × 1/3).
• Ask students what dividing by a fraction might mean in real life (e.g. cutting a sandwich into parts).
• Introduce the division concept emphasizing "How many groups of ‘fraction’ fit into another fraction?”

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0:20-1:20 — Teach & Explore "Keep, Change, Flip"

• Explain the method clearly:
  • Keep the first fraction the same
  • Change the division sign to multiplication
  • Flip the second fraction (take its reciprocal)
• Work through a problem as a class: 2/3 ÷ 4/5
  • Write as 2/3 × 5/4
  • Multiply numerators and denominators: 10/12
  • Simplify to 5/6
• Use fraction tiles or drawings to visualize why flipping the second fraction works.
• Model one mixed number division problem: 1 1/2 ÷ 1/3
  • Convert mixed number to improper fraction
  • Apply Keep, Change, Flip
  • Solve and simplify

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1:20-2:00 — Quick Practice & Formative Check

• Hand out mini whiteboards.
• Give students 2 quick problems:
  1. 3/4 ÷ 2/3
  2. 2 1/3 ÷ 1/2
• Set timer for 30 seconds per problem.
• Students write their answers and show them simultaneously.
• Provide immediate feedback: praise correct answers and prompt rethinking for errors.
• End by asking one student to verbally explain the "Keep, Change, Flip" rule concisely.

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Assessment

• Informal formative: Observe student participation and accuracy during the practice.
• Use student verbal explanation as a quick assessment for understanding.
• Teacher notes correct vs. incorrect answers and addresses misconceptions immediately.

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Wow Factor: Fraction Flip Challenge!

• Optional extension if time permits:
  • Present a "Fraction Flip Challenge" where students create their own real-life story problem involving dividing fractions, then solve it using Keep, Change, Flip.
  • This activity taps into CCSS Math Practice 3 (critique reasoning) and encourages creative thinking.

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Reflection

• Teacher reflects post-lesson on student grasp of reciprocal concept.
• Consider adding a visual fraction chart or digital fraction app next time for more engagement.

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This 2-minute mini-lesson packs conceptual clarity and quick practice tightly aligned to Common Core standards perfect for a small group!