My Primary School days included savings stamps (which I didn't really understand).
In my teens, I found that one good way to learn the value of money was to have a target to save towards - in my case, a Parker pen which I really wanted instead of the cheap 'almost-good-enough' pens I used at school. I saved for weeks and weeks and finally acquired my Parker pen for about 25/- (£1.25). I kept it for decades, and managed to lose it eventually, which really annoyed me - so I bought a replacement, and then found the first one tucked away in the bottom corner of my briefcase! I now have 2 identical Parker pens of my own, a third one that my father bought me, and now I use none of them because ballpoint pens and computer keyboards seem to have made them redundant in my house. Sad, really!
But it was good training.
All children, with concentrated schooling, can learn to read, write, add up and subtract as long as they have a systematic learning process and a motivational environment. My parents both left school at 14 but they wrote neatly, and you never saw them unable to spell properly, they could do most arithmetic accurately in their head - what they lacked was the wider range of subjects that are available to moden children, but the basics were learned much better. Post-school age learning after work provided the next level (to the extent that my father was teaching me Ohms Law when I was eight and elementary biology using a microscope at about the same age). It was this attitude that got 19th century miners into libraries in their 'spare time', to 'better themselves'. Motivation!!
If you are brought up from age 0 to see that people around you are curious about everything, you soon get in the same habit and learn about everything you come across - this is where many parents get it wrong, and don't enthuse their children with the wonders all around them.