Classical problem: "One person goes from A to B. Another from B to A. The first one has a 4 km/h speed and the second one has 6 km/h. Where do they meet if AB has length of 25 km". How do you transform this into more interesting problem? What is the key of this problem? What do you think? Please help me to improve the of this old .

I try to transform it into a more visual problem following the advice of Raj Shah

I attend to "How to Make Math More Like Video Games" by Raj Shah []. My aim is to transform something like this $\frac{3}{5} - \frac{1}{5}$ to this (picture). I'm thinking how to transform complex operations like $3 \frac{2}{5} - 2 \frac{1}{3}$.

Monday May 13th, students answered the question: what's the probability of one person chosen randomly hits the return of sound in Whitney Houston "I will always love you" and Roxette "She's got the look". Inspiration from El Hormiguero []. You can see the results of times and percentage of interval. We have to count errors. We set error < 5% is hit and otherwise fail (but really it needs more precision)


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