The problem isn't a lack of 1s or too many 1s.
Nor is it a lack of 10s or too many 10s...
They're just in the wrong place.

It's the same 1-to-10 exchange rate EVERY TIME you cross a place-value border:

10 smaller 1s make 1 bigger 1

1 bigger 1 makes 10 smaller 1s

#MTBoS #PlaceValue #Regrouping