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Unit 04 · Rates and PercentsLesson

Day 052Comparing Package Sizes

LearnClassworkAnswer keyPDF packet ↗
Standards 6.RP.A.3b
LEARNING TARGET

I can compare unit prices to find the better buy.

01 · LEARN

Build the idea

Divide total cost by the number of items or units. Compare costs for exactly one of the same unit. A lower package price does not always give a lower unit price.

WORKED EXAMPLE 1

Pack A has 7 markers for $14; Pack B has 13 markers for $32.5. Find each unit price and the better buy.

A $2/marker; B $2.5/marker; A is cheaper

Divide each price by its marker count; compare 2 with 2.5.

WORKED EXAMPLE 2

Pack A has 6 markers for $12; Pack B has 8 markers for $20. Find each unit price and the better buy. How much would 48 markers cost using each pack size?

A $2/marker; B $2.5/marker; A is cheaper; A $96, B $120

Divide each price by its marker count; compare 2 with 2.5.

02 · PRACTICE

Your turn

Work in order. Start with the foundations, then build toward explanation and application.

  1. Pack A has 7 markers for $21; Pack B has 13 markers for $45.5. Find each unit price and the better buy.

  2. Pack A has 2 markers for $14; Pack B has 7 markers for $52.5. Find each unit price and the better buy.

  3. Pack A has 3 markers for $12; Pack B has 8 markers for $36. Find each unit price and the better buy.

  4. Pack A has 6 markers for $18; Pack B has 12 markers for $42. Find each unit price and the better buy.

  5. Pack A has 4 markers for $6; Pack B has 7 markers for $14. Find each unit price and the better buy.

  6. Pack A has 5 markers for $20; Pack B has 9 markers for $40.5. Find each unit price and the better buy.

  7. Pack A has 3 markers for $4.5; Pack B has 9 markers for $18. Find each unit price and the better buy. How much would 27 markers cost using each pack size?

  8. Pack A has 7 markers for $24.5; Pack B has 12 markers for $48. Find each unit price and the better buy. How much would 84 markers cost using each pack size?

  9. Pack A has 3 markers for $9; Pack B has 6 markers for $21. Find each unit price and the better buy. How much would 18 markers cost using each pack size?

  10. Pack A has 3 markers for $12; Pack B has 9 markers for $40.5. Find each unit price and the better buy. How much would 27 markers cost using each pack size?

03 · CHECK

Answers and reasoning

Reveal the teacher answer key
  1. A $3/marker; B $3.5/marker; A is cheaper

    Divide each price by its marker count; compare 3 with 3.5.

  2. A $7/marker; B $7.5/marker; A is cheaper

    Divide each price by its marker count; compare 7 with 7.5.

  3. A $4/marker; B $4.5/marker; A is cheaper

    Divide each price by its marker count; compare 4 with 4.5.

  4. A $3/marker; B $3.5/marker; A is cheaper

    Divide each price by its marker count; compare 3 with 3.5.

  5. A $1.5/marker; B $2/marker; A is cheaper

    Divide each price by its marker count; compare 1.5 with 2.

  6. A $4/marker; B $4.5/marker; A is cheaper

    Divide each price by its marker count; compare 4 with 4.5.

  7. A $1.5/marker; B $2/marker; A is cheaper; A $40.5, B $54

    Divide each price by its marker count; compare 1.5 with 2.

  8. A $3.5/marker; B $4/marker; A is cheaper; A $294, B $336

    Divide each price by its marker count; compare 3.5 with 4.

  9. A $3/marker; B $3.5/marker; A is cheaper; A $54, B $63

    Divide each price by its marker count; compare 3 with 3.5.

  10. A $4/marker; B $4.5/marker; A is cheaper; A $108, B $121.5

    Divide each price by its marker count; compare 4 with 4.5.

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