Earlier I wrote about remembering fractions of 6 due to influence of cricket. In the footnotes there, I mentioned also being good with number 7.

I remembered why I (subconsciously) *know* so many multiples and fractions of 7. It’s got to do with all those physics problems in high school.

Gravitational acceleration (`g`

) near earth is `9.8m/s`

^{2}. This can also be written as `7*7*2/10`

.

2 and 10 are easy to manoeuvre. 7 required me to calculate the fractions and multiples.

Since there were a lot of questions with *g* involved, I subconsciously memorised the frequent multiples and fractions. Now, decades later, I still (subconsciously) remember a fair number of them without having to bother with the calculation.