However, a few on the platform stated that this trick in fact is not news to them. One said: “Depends on your age because I definitely learnt this in the 70s and the 80s”
Another commented: “We used to use that, I’m Gen X”
Another woman took the opportunity to share her own hack for the nine times table. She said: “Wait is the fingers trick not taught anymore? Hold out both your hands palms out, put down the finger matching the number you are multiplying nine by.
“Count the fingers still up to the left, that’s the first digit. Count the fingers still up to the right, that is the second digit.
“For example: 9×3 put third finger (left hand middle finger down). You’ll have two fingers still up on the left and seven fingers still up on the right. So, 27.”