The teacher starts at the top, pronouncing one of the two words in each line, moving down until reaching the bottom and arriving at a specific number. The students listen and try to choose each correct word as pronounced by the teacher until they end on the correct number at the bottom.
Files:
If anyone wants to adapt this activity to other sounds - and thnaks to kentstray it is very easy to do so - you can find minimal pairs at https://www.englishclub.com/pronunciation/minimal-pairs.htm
This went super well in my third grade JHS class and everyone learned something I think
I love this but I was, however, clowned on for the lack of a number 31 on the worksheet by an astute coworker.