A visual discussion starter for you:
These three pots of sandwich filling cost £1 each. The flavours are egg mayo, chicken & bacon and cheese & onion.
How much would the 182g chicken filling cost if it weighed the same as the others?
The large pots contain 5 servings and the small pot contains 3 servings – are they the same size serving?
If you zoom in on the picture you could generate your own questions based on the nutritional information eg calories per serving.
You could extend this to the snacks in students’ bags. Are they as healthy as they think?