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Converting units of time review (seconds, minutes, & hours). Common Core Math: medcareromania.comA.1, medcareromania.comA Review the size of seconds, minutes, and hours and how. Hours[edit]. There are also 60 minutes per hour, which means there are 60×60 or seconds per hour. Hours are abbreviated "hr" or. Therefore, 6 hours + 40 minutes = (6 x 60) minutes + 40 minutes = ( + 40) Therefore, 4 minutes 25 seconds = (4 x 60) seconds + 25 seconds = ( + 25). Solved examples: 1. Convert 6 hours into seconds. First, we convert hours into minutes and then minutes into seconds. 6 hours = (6 × 60) minutes (1 hour = So 6 hours and 7 minutes is 6 7/60 hours. To convert to a decimal, divide the numerator by the denominator: _ 1 6 ______ 60) 0 0 0 6 0. Why is a minute divided into 60 seconds, an hour into 60 minutes, yet there are only 24 hours in a day? Share on . A History of Mathematics. Florian Cajori. Adding and Subtracting Time. Add or Subtract the hours and minutes separately. But you may need to do some adjusting if the minutes end up 60 or more. Babylonian mathematics was any mathematics developed or practiced by the people of The Babylonian system of mathematics was a sexagesimal (base 60) of 60 seconds in a minute, 60 minutes in an hour, and degrees in a circle. The Standards for Mathematical Practice focus on the nature of the learning experiences by It takes Gianna hours or 3 hours and 20 minutes to make $ More:   
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