I liked the concept of having similar coffee bottles and putting some paperclips in it and asking the students to guess it. He gave us a sample of 3 paperclips in the bottle and he shook it. We had to estimate the number of clips in the bottle using the sound it made when shaking it. It woke up my listening skills to be sharper. I shook the bottles several times to get the answer.
The right way for using language when explain less. I learnt that proper English has to use to say less or more. For example: “6 is less than 8” and not “6 is lesser than 8.” If you compare the both typed above it makes sense.