⚖️ Part 1: Understanding Scales and Units

1. Which unit would be best for measuring the mass of a pencil?

grams

kilograms

2. Which unit would be best for measuring the mass of a bag of flour?

grams

kilograms

3. Before measuring an object on a scale, what should you always do first?

Put the object on the scale

Zero or tare the scale

Guess the mass first

4. Convert these measurements:

a) 1500 grams = _______ kilograms

b) 2.5 kilograms = _______ grams

c) 750 grams = _______ kilograms

📏 Part 2: Reading Scales and Recording

5. Look at this digital scale reading: 0.850 kg. Write this measurement in grams: _______

6. A scale shows 1250g. Circle the correct decimal form in kilograms:

1.25 kg

12.5 kg

125 kg

7. Estimate then measure the mass of three classroom objects. Record your results:

Object 1: ________________

Estimate: _______ grams Actual: _______ grams

Object 2: ________________

Estimate: _______ grams Actual: _______ grams

Object 3: ________________

Estimate: _______ grams Actual: _______ grams

🧠 Part 3: Problem Solving

8. Sarah is packing a lunch box. She measures: apple (150g), sandwich (220g), and drink bottle (340g). What is the total mass in grams? Show your working.

9. Extension Challenge: A recipe needs 2.3 kg of ingredients. You have measured 1800g so far. How many more grams do you need? Convert your answer to kilograms as well.

10. Explain why it's important to measure mass accurately in real life. Give two examples.