4th Grade Math 12.8, Compare Units of Time

An analog clock has an hour hand, a minute hand, and a second hand to measure time. There are 60 seconds in 1 minute. There are 60 Minutes in 1 hour. We can skip-count seconds or minutes by 5. When 1 second passes, the second hand moves clockwise one small line. When 1 minute passes, it's 60 seconds, the minute hand moves clockwise one small line. We show how we can write time using two colons (00:00:00) separating hours, minutes, and seconds. When 1 hour passes, it's 60 minutes, the hour hand moves clockwise to the next number. The minute hand has made a full turn around the clock face. Each full turn of the minute hand is 1 hour, no matter where the minute hand has started from. 1 hour is 60 times greater than 1 minute, and 1 minute is 60 times greater than 1 second. We can compare the size of an hour to the size of a second by using multiplication. We can use a table or a number line to compare hours and minutes, or weeks and days, or years and months. There are 24 hours in one day and we can use multiplication to find how many hours are in more days. We discuss that every 4 years is a leap year with an extra day called a leap day.

4th Grade Math 6.3, Fractions in Simplest Form, a.k.a. Reducing
https://youtu.be/pccNZ9CKm4g

Clocks, Time, and Calendars Playlist
https://www.youtube.com/playlist?list=PLKi4WTp6PRGWC6I3ltUlMls0rzLQJlcrl

4th Grade Math Playlist
https://www.youtube.com/playlist?list=PLKi4WTp6PRGX7RhcxctRibNb7V091JZfn

I'm using the Houghton Mifflin Go Math!
2015 copyright textbook for this playlist.

You can practice online using the textbook's website
https://www.gomathacademy.com/

YouTube rating for JoAnn's School videos:
L0 - No strong language
N0 - No nudity
S0 - No sexual situations
V0 - Not violent or disturbing
D0 - No drug reference or content
F0 - No flashing lights content

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