Why are kids saying "6-7" and what does it mean?

The origins of the viral '6-7' meme confusing parents and teachers alike

Where does the phrase '6-7' come from?

Super Facts about 6-7 - Numberphile

Where Did 6/7 Come From? What Does 6/7 Mean?

What does the phrase "6-7" mean? And where did it come from?

6 7 FINALLY EXPLAINED

‘6 7’ is the new trend taking over social media - but what does it mean? | Stuff.co.nz

What Does it Mean When Kids Say 6-7?

The DARK truth behind the 6 7 meme

The first documented occurrence of “6 7” in history (1960)

What was the 6-7 Trend?

What Does the Viral Internet Meme “6-7” Actually Mean?

6-7 Numberblocks Song ("Six seven") #67 #SixSeven #numberblocks #numbers

What is 6 7?

Official 6 7 Song (by PASMath.com)

Why Kids Are Screaming “6-7” in Classrooms Everywhere | Vantage with Palki Sharma

Understanding the Meaning of 6 7 in Chinese