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>It seems silly looking back that I was solving problems on the number line as an adult.

I study biostatistics and dabble in population genetics research. I still resort to number lines and venn diagrams frequently. There is a reason we teach number lines - they are very useful!

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Where exactly do you use number line? Thanks.

I don’t recall ever learning number lines in school. Was in eighties. Are number lines a new teaching tool or am I just not remembering this?

You might be forgetting them, it's literally just a line with numbers marked on it. I learned them in primary school in the 90s, further classes never used them but they've always been useful tools for visualizing relationships between numbers.

Usually just when I am having trouble with an idosyncratic number scale. So usually when I need to make sense of dates and the time between them. It's often got nothing to do with work, but I do use them in my personal life.

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