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Telling time, counting goods, counting money.
in earlier times time was measured by sandclock or waterclock
Counting by 5s and counting by 10s are similar because both involve skipping numbers to reach the next multiple. When counting by 5s, you add 5 to the previous number each time. When counting by 10s, you add 10 to the previous number each time. Both methods are efficient ways to quickly determine the multiples of a given number.
Mass divided by time, where the mass is measured in tons and the time is measured in hours. If the mass and time are measured in other units they will need to be converted to tons and hours.
No - because time is measured in seconds, not linear distance.