📚 Part 1: WALT, Success Criteria & Multiple Choice

WALT: Choose suitable units to estimate mass and read kg, g and lbs on scales.

Success Criteria: I can identify kg, g and lbs; I can read masses on scales; I can convert between kg and g and approximate kg→lbs.

Differentiation & Support: Use pictures and large text; work in pairs; teacher will check units. Extension: convert kg to lbs using 1 kg ≈ 2.2 lbs.

1. Which unit would you use for the mass of a bag of flour?

grams (g)

kilograms (kg)

pounds (lbs)

2. A chocolate bar has mass about 50 ___.

g

kg

lbs

3. Which is the best approximate conversion?

1 kg ≈ 2.2 lbs

1 kg ≈ 10 lbs

1 kg ≈ 0.2 lbs

4. Tick all that are usually measured in grams (g):

A small packet of sugar

An adult person

A chocolate bar

A large bag of potatoes

✏️ Part 2: Short Answers & Conversions

5. Read this scale: the needle points between 2.2 kg and 2.4 kg at 2.3 kg. Write the mass in kg and g.

6. Convert: 750 g = ____ kg

7. Convert approximately: 5 kg ≈ ____ lbs (use 1 kg ≈ 2.2 lbs)

8. Match each item to the best unit to measure its mass:

A. An apple

B. A cat

C. A packet of rice (1 kg)

1. kg

2. g

3. lbs

🔍 Part 3: Practical Challenge & Homework

9. Estimation challenge: Look around the classroom and estimate the mass of one of these items. Write your estimate and then measure with a scale if available.

Item: ___________ — Estimated mass: _________ (include unit: g / kg / lbs)

10. Extension (for advanced learners): Convert 2.5 kg to lbs showing a short calculation (use 1 kg ≈ 2.2 lbs).

Homework: Find 3 household items. Estimate their mass and record each in the best unit (kg or g). Ask an adult if they know their weight in kg or lbs and write it down.