If only I knew this before my maths Exam

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I saw this and didn’t understand...
How Japanese kids learn to multiply in primary school
The explanation:
If you're anything like me, who doesn't like math
U MATH (ANO WHOM MATH DOESN'T LIKE
BACK...). ANO IS MORE OF A VISUAL PERSON,
THEN TH1S IS AN AMAZING SIMPLE WAY TO DO QUICK MULTIPLICATION.

I HAD TO HAVE THIS EXPLAINED TO ME CLOSELY,
BUT IT WAS AMAZING WHEN IT FINALLY CLICKED INTO PLACC. LOL
S0 HERES HOW IT GOES!

LET’S US A DIFFERENT EXAMPLE FROM THE ONE IN THE PHOTO. IN THIS CASE, WE'LL USE.
15 X 23