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Math lesson plan · 5th grade (Year 6 in England) · 60 minutes

Predict the size of a product: multiplying as scaling

Fractions

CCSS 5.NF.B.5.ACCSS 5.NF.B.5.BEngland: Y6 Fractions

Objective and success criteria

Students will: Predict the size of a product: multiplying as scaling.

  • I can answer questions on today's skill on my own, without help.
  • I can explain each step and say why it works.
  • I can check my answer and spot a mistake.

Before and after

Needs first: Multiply fractions

Leads to: the next skill in this area.

Materials: Fraction strips or a fraction wall, Paper strips to fold, Number lines, Mini whiteboards and pens, Printed student sheet (below).

Warm-up · 6 min

  • Quick retrieval from earlier learning (Multiply fractions). Students answer on mini whiteboards.
  • Show answers together and note who needs support in the main task.
  1. Mei has 72 metres of ribbon and uses 2/8 of it. How many metres is that? → 18Prompt: "Of" means multiply: 2/8 × 72.
  2. Jamal has 6 metres of ribbon and uses 1/2 of it. How many metres is that? → 3Prompt: "Of" means multiply: 1/2 × 6.
  3. Ines has 21 metres of ribbon and uses 1/3 of it. How many metres is that? → 7Prompt: "Of" means multiply: 1/3 × 21.

Hook · 6 min

  • Cut a pizza or a strip of paper unevenly and ask whether the pieces are really halves or quarters.
  • Share the objective: Predict the size of a product: multiplying as scaling. Read the success criteria together.

I do: model it · 12 min

  • Work through the example out loud, saying why you do each step, not just what you do.
  • Example: Without calculating: is 89 × 5/3 less than, greater than or equal to 89?
  • Step 1: 5/3 > 1
  • Step 2: greater than 89
  • Answer: greater than 89
  • Pause after each step and ask a student to say what comes next.

We do: guided practice · 12 min

  • Do these together. Students try each step on whiteboards before you reveal it.
  • Use the hints as prompts rather than giving the answer.
  1. Without calculating: is 72 × 5/5 less than, greater than or equal to 72? (less than 72 / greater than 72 / equal to 72) → equal to 72Prompt: Is 5/5 less than 1, more than 1, or exactly 1?
  2. Which product is greatest? 55 × 7/8, 55 × 3/2, 55 × 5/4 (55 × 7/8 / 55 × 3/2 / 55 × 5/4) → 55 × 3/2Prompt: Every product uses 55, so compare the fractions.

You do: independent practice · 17 min

  • Students work on the student sheet. Circulate and check the first two answers of every student early.
  • Students who finish: write a question of their own for a partner, with the answer.

The 8 questions are on the student sheet below, with answers in the key.

Exit ticket · 7 min

  • Two questions on their own. Sort answers into got it / nearly / not yet to plan the next lesson.
  1. Which product is greatest? 49 × 7/8, 49 × 3/2, 49 × 1/2 (49 × 7/8 / 49 × 3/2 / 49 × 1/2) → 49 × 3/2Prompt: Every product uses 49, so compare the fractions.
  2. Without calculating: is 47 × 5/5 less than, greater than or equal to 47? (less than 47 / greater than 47 / equal to 47) → equal to 47Prompt: Is 5/5 less than 1, more than 1, or exactly 1?

Watch out for

  • Thinking a bigger denominator means a bigger fraction (1/8 > 1/4).
  • Adding the denominators when adding fractions (1/2 + 1/3 = 2/5).

Support and stretch

Support

  • Review first: Multiply fractions.
  • Use concrete materials: fraction strips or a fraction wall.
  • Give the first step of each question, or a partly worked example to finish.
  • Pair with a confident partner for the guided practice.

Stretch

  • Explain a common mistake in writing and how to fix it.
  • Write a word problem that uses today's skill, then solve a partner's.

Homework and more practice

Free online practice with hints and printable worksheets for this skill: eurekami.com/math/grade-5.

Free lesson plan from eurekami.com/lesson-plan-builder

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Predict the size of a product: multiplying as scaling

Name

Date

Score/ 8

  1. Question 1

    Which product is greatest? 25 × 7/8, 25 × 3/2, 25 × 5/4

    • A. 25 × 7/8
    • B. 25 × 3/2
    • C. 25 × 5/4

  2. Question 2

    Without calculating: is 72 × 4/4 less than, greater than or equal to 72?

    • A. less than 72
    • B. greater than 72
    • C. equal to 72

  3. Question 3

    Which product is greatest? 39 × 5/4, 39 × 1/2, 39 × 3/4

    • A. 39 × 5/4
    • B. 39 × 1/2
    • C. 39 × 3/4

  4. Question 4

    Without calculating: is 26 × 7/3 less than, greater than or equal to 26?

    • A. less than 26
    • B. greater than 26
    • C. equal to 26

  5. Question 5

    Which product is greatest? 26 × 1/2, 26 × 3/2, 26 × 3/4

    • A. 26 × 1/2
    • B. 26 × 3/2
    • C. 26 × 3/4

  6. Question 6

    Without calculating: is 51 × 5/5 less than, greater than or equal to 51?

    • A. less than 51
    • B. greater than 51
    • C. equal to 51

  7. Question 7

    Which product is greatest? 54 × 7/8, 54 × 5/4, 54 × 3/4

    • A. 54 × 7/8
    • B. 54 × 5/4
    • C. 54 × 3/4

  8. Question 8

    Without calculating: is 19 × 5/8 less than, greater than or equal to 19?

    • A. less than 19
    • B. greater than 19
    • C. equal to 19

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Answer key: Predict the size of a product: multiplying as scaling

  1. 1. B. 25 × 3/2

  2. 2. C. equal to 72

  3. 3. A. 39 × 5/4

  4. 4. B. greater than 26

  5. 5. B. 26 × 3/2

  6. 6. C. equal to 51

  7. 7. B. 54 × 5/4

  8. 8. A. less than 19