That calculator with the number discs is a really clever idea! I could have used something like that when my kids were learning how to carry 10s.
I wish it had been a learning tool when I was learning how to carry 10s XD
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RE: [Esp-Eng] Estrategia para aprender a sumar llevando // Strategy for learning to add by carrying
Certainly at our time there were no such creative strategies haha, luckily there are more resources for our children, I think your kids would have liked it but you sure taught them well.