00:00Hey guys, I am the number one and today I have some problems.
00:07I have a dodgeball competition but need help with knowing what time it starts.
00:12Can you help me?
00:14Great, thank you so much.
00:16Let's go and look at my clocks so we can figure out when I need to leave.
00:22To help me out, I need to learn about elapsed time.
00:25Here is a clock with an hour hand and a minute hand.
00:30Can you tell me what the current time is?
00:34The time is 3 o'clock.
00:36We know this because the hour hand points to the 3 and the minute hand is pointing at the 12, which is where the minutes start.
00:44The clock shows it's 3 o'clock.
00:47Now can you tell me what time it will be in 3 hours?
00:52If you did not know this, do not worry since we are learning together.
00:57Since we have another clock here, we can move the hour hand 3 hours ahead.
01:01So we move the hour hand 1, 2, 3 hours.
01:06It is now pointing at 6 o'clock.
01:08So 3 hours past 3 o'clock is 6 o'clock.
01:12Great job guys!
01:13Let's look at some more.
01:19Right now the time is 6.20 and my mom said school starts in 1 hour and 10 minutes.
01:24What time will it be in 1 hour and 10 minutes?
01:28Whenever I get a question like this, I like to imagine how the hands on the clock move.
01:34For example, we know that every time the minute hand makes a complete rotation, the hour hand has moved by exactly 1 hour.
01:43Let me show you what I mean.
01:45I will move the minute hand all the way around the clock once to show 1 hour has passed.
01:52Did you notice that the hour hand moved as well?
01:57We started at 6.20 and we need to know what time it will be in 1 hour and 10 minutes.
02:03We just moved the clock ahead 1 hour.
02:06The clock now reads 7.20.
02:08We have moved the time up 1 hour from 6.20.
02:12Great job guys!
02:13You are doing awesome!
02:14Now we need to move the minute hand forward 10 minutes.
02:19What is the time now?
02:23The time is 7.30.
02:25That is so awesome!
02:26So when my mom said school started in 1 hour and 10 minutes,
02:30we can see that school starts at 7.30.
02:33Great job guys!
02:37We have seen two problems that we were able to solve,
02:40but now I need help knowing when my dodgeball competition is.
02:44Right now it is 4.30 and my competition schedule says I need to be at the dodgeball court in 2 hours and 45 minutes.
02:51I love dodgeball and do not want to miss my competition, so let's figure this out.
02:56Since we have another clock here to use, let's move the hands ahead starting with the minutes.
03:03Now we need to remember that when the minute hand moves all the way up to the 12, it starts a new hour.
03:08That means the hour hand will need to be moved up to the next hour.
03:12Right now it is 4.30 and we need to move the minute hand 45 minutes.
03:17We can count by 15 minutes to make it easier.
03:20Count with me as we count each 15 minute increment.
03:2515, 30, 45...
03:29Wait!
03:30Remember that when the minute hand moves, so does the hour hand.
03:33The minute hand is now pointing at 15 minutes after the hour.
03:37Because the minute hand had moved past the 12, the hour hand should not stay at 4 o'clock, but should be 5 o'clock.
03:45Remember, when the minute hand moves, so does the hour hand.
03:49Now the clock reads 5.15.
03:52Great job so far!
03:55We have to move the clock ahead by 2 hours and 45 minutes.
03:58We have already moved the clock ahead 45 minutes.
04:01Now let's add 2 hours.
04:03To add 2 hours, do we move the hour hand or the minute hand?
04:09Correct!
04:10We move the hour hand ahead by 2 hours.
04:14What time is this on the clock?
04:17The time is 7.15.
04:21Great job!
04:22My dodgeball competition starts at 7.15.
04:26Thank you so much!
04:27That last one is pretty cool, but with practice and visualizing a clock in your head, you will be excellent at this.
04:36Great job kids!
04:38Goodbye!
