In this instance I probably would have done the same, however, I must point out this - if you or I can't remember these from our schooling days, how often (if ever) have we used them in real life?
So even though I agree with your post, I find it more and more absurd that kids are being taught things like this that may have a very very small foundational impact (if any at all) on how well they can budget in the real world when they are adults.

Just my brain throwing this thought out there. I'd rather teach my kid how to grow her own food 😊