these resources are based on one of the tasks he used

students can have interesting discussions, occasionally heated, about which jar has a better chance of a 'success' - these notions can be:

- a misconception (same number of ... in each, or, more .... in this one)
- based on good insights (if you double the number in A...)
- created by an appreciation of ratio (there is one ... to one and a half....)
- equivalent fractions (maybe compared as decimal equivalents)

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