To go from seconds to minutes we use a ratio of 60 to 1. To go from hours to days, we use 24 to 1 . But most of our clocks only show hours up to 12, so children have to learn there is a morning set of 12 which starts at midnight, and an afternoon set of 12 which starts at noon. To go from days to months children have to learn this is flexible, but 30 to 1 is often used. After this last, it seems we finally go back to a ratio of 10 to 1.
Years become a decade, decades become a century, and centuries become a millennium.
When it comes to measuring distance or length, weight, and volume, we in Canada have a unique problem. Many, many years ago our government decided it knew that what would be best for us was to switch to the metric system, despite the fact that our largest trading partner was still using, and continues to use, measures based on the English Imperial systems. Now we have to learn to operate in both systems, the old and the new. These are the measurements that are people sized. In the metric system we have millimetres to centimetres at 10 to 1, centimetres to decimetres at 10 to 1, and decimetres to metres at 10 to 1.