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Weight Mystery Case File
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Weight Mystery Case File
A parcel has arrived at the village science fair, but its label has fallen off. Use the evidence in this case file to compare masses, convert between grams and kilograms, and identify the heaviest object. Remember: 1 kg = 1,000 g. Show your calculations where asked.
Evidence log
The parcels were weighed on the same digital scale. These measurements are the evidence for every case question.
Parcel A — 1,250 g
Parcel B — 750 g
Parcel C — 1 kg 50 g
Parcel D — 0.9 kg
1.Write Parcel A's mass in kilograms, and Parcel D's mass in grams.
2.How much heavier is Parcel A than Parcel B? Give your answer in grams.
3.Use the number line to help you order Parcels A, B, C and D from lightest to heaviest. Write the parcel letters in order.
4.Which parcel is the heaviest, and what is its mass in kilograms?
- Parcel A — 1.25 kg
- Parcel B — 0.75 kg
- Parcel C — 1.05 kg
- Parcel D — 0.9 kg
5.A note says, “Parcel C is 300 g heavier than Parcel B.” Is the note correct? Show how you know.
6.The fair organiser puts Parcels B and D together in a display basket. What is their combined mass in kilograms?
7.What is the total mass of all four parcels? Give your answer in kilograms and grams.
8.A detective writes: “1 kg 50 g = 1.5 kg.” Explain the mistake and give the correct conversion.
9.Would you usually measure the mass of a full schoolbag in grams or kilograms? Choose a unit and explain why.
10.The mystery object is heavier than Parcel D and no heavier than Parcel C. Which parcel is it? How much heavier is it than Parcel D?
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