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First/Measurement

Mass & Weight Word Problems

Solve word problems involving mass and weight (kg, g, lb, oz, tons).
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Study Guide

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Practice Questions

  1. A baker 👨‍🍳 needs 2 kg of flour. He has 1,500 g. How many more grams does he need?
    Show answer

    500 g

  2. A baby elephant 🐘 weighs 200 lb at birth. How many ounces is that?
    Show answer

    3,200 oz

  3. A truck 🚛 carries 3 tons of sand. How many pounds is the sand?
    Show answer

    6,000 lb

  4. A cat 🐈 weighs 4 kg. A dog 🐕 weighs 12 kg. What is their total weight in grams?
    Show answer

    16,000 g

  5. A box of cereal 🥣 weighs 1 lb 4 oz. How many ounces is that in total?
    Show answer

    20 oz

Quick Tip
Pay attention to the units. 1 kg = 1,000 g, 1 lb = 16 oz.
Teacher Resources
Teaching Notes

This collection focuses on mass & weight word problems. Encourage students to underline key numbers and words in the problem.

Vocabulary
Mass: Amount of matter in an object.
Weight: Force of gravity on an object.
Common Mistakes
  • Not converting units before calculating (e.g., subtracting meters from kilometers)
  • Misplacing the decimal point in money problems
  • Confusing AM and PM in time problems
  • Incorrect unit conversions
  • Mixing customary and metric units
  • Calculation errors in word problems
  • Misinterpreting problem context
Differentiation
SupportProvide a checklist for solving word problems (Read, Plan, Solve, Check).
ChallengeAsk students to write their own multi-step word problems.
Discussion Questions
  • How do you know which operation (add, subtract, multiply, divide) to use?
  • Why is it important to check your units?
  • How can estimation help you check if your answer is reasonable?
  • Why are different units of mass used?
  • When might we estimate mass or weight?
  • How does converting units help in daily life?
  • Name objects that weigh approximately 1 kg or 1 lb.
Extension Activities
  • Create a class store where students buy and sell items.
  • Plan a trip and calculate distances and travel times.
  • Bake a recipe and adjust the quantities for a larger group.
Parent Tip

Weigh different objects at home and discuss their mass.

Learning Path
Skill Cluster

Measurement & Data

Estimated Time

20 minutes

Skills Practiced
Mass & weight word problems