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Third/Measurement

Customary Weight Conversion with Decimals

Convert customary weights involving decimals.
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Study Guide

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Practice Questions

  1. 2.5 lb = ? oz
    Show answer

    40

  2. 1.5 T = ? lb
    Show answer

    3,000

  3. 0.5 lb = ? oz
    Show answer

    8

  4. 3200 lb = ? T
    Show answer

    1.6

  5. 24 oz = ? lb
    Show answer

    1.5

Quick Tip
16 oz = 1 lb (pound)   |   2,000 lb = 1 T (ton)
Teacher Resources
Teaching Notes

This collection focuses on customary weight with decimals. Ensure students understand the relationship between ounces, pounds, and tons.

Vocabulary
Decimal: A number with a point.
Conversion factor: Number used to change units.
Common Mistakes
  • Confusing the conversion factors (16 vs 2000)
  • Multiplying instead of dividing
  • Forgetting to label units
  • Incorrect conversion factor
  • Decimal point errors
  • Forgetting units in answer
Differentiation
SupportProvide a conversion chart. Use real-world examples like a loaf of bread (1 lb) or a small car (1-2 tons).
ChallengeChallenge students to convert across multiple steps or use decimals.
Discussion Questions
  • Why do we use tons for heavy things like cars?
  • How many ounces are in half a pound?
  • When would you use pounds instead of ounces?
  • When is converting weights useful?
  • Why use decimals for precision?
  • How do pounds relate to ounces?
  • What if you convert larger units?
Extension Activities
  • Weigh objects in the classroom.
  • Estimate weights of various items.
  • Research weights of animals.
Parent Tip

Ask your child to measure liquids using measuring cups with decimal markings.

Learning Path
Skill Cluster

Measurement and Data

Estimated Time

15 minutes

Skills Practiced
Customary weight with decimals