Stage 1 · The World of Numbers / #1
Make Ten: Why Split the 5 in 8+5?
S-1 · Numbers are amounts S-2 · The equals sign is a balance S-3 · Units can be redefined S-6 · Mistakes are fine — try it
Coming soon
The video is in production. Follow along on GitHub to hear when it is out.
The idea
Split the five into two and three, fill up a ten first, and thirteen shows at a glance, with nothing lost.
A common mix-up
Eight plus five means counting up from eight one at a time; breaking the five apart loses some.
Where it stops working
Three plus four is less than ten and doesn't fill the frame, so making ten doesn't help; just count.
School year
China 1 US 1 UK 1–2 Singapore 1