Basic problems in time management and time intervals can be solved by calculations. This may involve changing decimal time to hours and minutes.
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Calculating a time interval means working out how long something takes. It could be how long someone spends at work or how long a train journey lasts.
Most of the time we count using the decimal system of units, tens, hundreds etc.
But time is counted differently:
You need to bear this in mind when adding or subtracting seconds from minutes or minutes from hours.
