Borrowing in subtraction:
Carry in addition:
MERGED 2016/11/10:
And from a dialog on Twitter: https://twitter.com/macajo/status/793790918788837376
The following Video: Subtraction: 534-486:
Reflections about the maths daily in the world around us. The nummolt - mathcats materials, the mathematics behind them and related to them. Math education and apps. Primes as the basic building blocks of numbers
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