My father did the same, and it helped me immensely. He also did eyeball estimates of weights/volumes/etc. (farmers excel at this, IME)
I constantly do back of the envelope calculations with my 8 yo son. Much of parenting is a guess but I feel certain this is valuable.
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Eg, while sitting at a bookstore cafe: "the cafe is ~400 ft^2, the store ~10k, same-ish # of sales - what is the sales ratio?"
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Minimally, he'll learn what envelopes were before they fade entirely from our material culture!
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Fast bounding/BOE calcs usually survive contact with reality quite well. Over detailed plans & perfect numbers not so much. ;-)
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Having been a kid who gained an intuitive grasp of numbers this way: Yes, this is extremely valuable.
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That's what Feynman's father did with him. They figured out once that a T. Rex could put his head through the window on the 3rd floor.
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Cool that you are doing this, and cool that you are sharing part of your parenting journey. Did you learn your style from your father?
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Enrico Graham
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As someone who did not enjoy that: I share your certainty!
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