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Weight Mystery Case File

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⚖️ Weight Mystery Case File

Group 2 — Top Secret Investigation

Mystery package illustration

📦 Mission Briefing

A mysterious package has arrived at headquarters. No one knows what is inside — but YOU do! Your mission is to use your weighing skills to crack the clues and identify the mystery items. Work carefully, measure accurately, and record your findings below.

⚠️ Remember: 1 kg = 1,000 g. Use your scales wisely, agents!

🔍 Clue Investigation — Record Your Measurements

Weigh each item from your mystery kit and record the weight below.

Step 1: Estimate the weight of each item before measuring, then record the actual weight.

Item A:

My estimate: _____________    Actual weight measured: _____________

Item B:

My estimate: _____________    Actual weight measured: _____________

Item C:

My estimate: _____________    Actual weight measured: _____________

Item D:

My estimate: _____________    Actual weight measured: _____________

🕵️ Crack the Clues

Use your measurements and the clues below to solve the mystery. Show all your working!

Clue 1: The combined weight of Item A and Item C is 1,800 g. Do your measurements match? What is the difference between your result and 1,800 g?
Clue 2: Item B weighs 500 g less than Item C. Use your measurements to check — is this true for your items? Show your subtraction.
Clue 3: The heaviest item weighs twice as much as the lightest item. Which items are these in your kit? Write their weights and check by multiplying.
Clue 4: The total weight of all four items is less than 3 kg. Add up your measurements. Is the total under 3 kg? Write the total in both grams and kilograms.
Order all four items from lightest to heaviest using your measurements:

Lightest →     _______     _______     _______     _______     → Heaviest

📝 Exit Quiz — Solo Challenge

Complete this section on your own. No group help!

1. Convert these weights:

2,500 g = _________ kg      3.75 kg = _________ g      900 g = _________ kg

2. A mystery box weighs 1.2 kg. A second box weighs 850 g. What is the total weight of both boxes in grams?
3. Which unit would you use to weigh each item? Circle your answer.

A feather:   

grams   
kilograms

A schoolbag:   

grams   
kilograms

A grain of rice:   

grams   
kilograms

4. How did your group use reasoning to solve the clues? Write one strategy that helped you.

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