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You may count by tens, but the system is based on 60...60 seconds in a minute, 60 minutes in an hour. One half of an our is not 5 minutes, nor even 50 minutes, no how much you want it to be. If it's 7:30 now, in 45 minutes it will not be 7:75. I'm guessing your kids know this.
One half of an hour is 30 minutes and it is hour by the way. lol lol
And yes it repeats every 60 of either whee.... So what?