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The chocolate bar did not have the weight printed anywhere we could see. So the student ('A' to protect the innocent as there is a diet involved here) snapped the label and sent me a copy.
There is enough information in the picture above to find the weight of the bar. I used this as a starter in another Foundation GCSE lesson, I just printed out several colour copies of the image and asked "can you find the weight".
I'm going to try this in a Higher GCSE lesson as follows:
If the kcal figures are rounded to the nearest whole kcal, what is the smallest and largest weight consistent with the figures?
I make it
Not that much variation.
Keith Burnett, Last update: Tue Apr 01 2014