There are many concepts to "understanding time". Â However, I would say that around 6 for my oldest and 8 for my second child. Â That includes all the main topics including reading both types of clocks, having a good idea of how long a half-hour, hour, etc is, simple math with clocks, and more. Â However, telling the time with a regular (non-digital) clock, was hardest for my second dd (this last skill wasn't really solid until shortly after she turned 8). Â Like someone else mentioned, when the hour hand is really close to the next hour--that is tough (like 1:45-1:59 ran the risk of being called 2:45-2:59). Â But then, I found a little plastic clock (unlike our others) in which the two hands did not move independently. Â As my dd moved the minute hand, the hour had would move appropriately. Â I would call out times to her and have her "set the clock". Â She caught on really quickly with that clock. Â (And it was only $2.00!)
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My youngest is 5 and can read a digital clock. Â She understands that there is an 8:00 in the morning as well as an 8:00 in the evening, though she doesn't yet refer to them as AM/PM. Â She still refers to "nightime" as anytime it is dark outside and "daytime" as anytime it is light outside. Â She does grasp how long 10 min, 30 min, and an hour is. Â But, I think that anything beyond an hour is simply thought of as a "really long time". Â
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Amy