Question Video: Calculating End Times to the Nearest Hour Mathematics

It is 2 o’clock. Pick the time it will be in 1 hour.


Video Transcript

It is 2 o’clock. Pick the time it will be in one hour. 1 o’clock, 3 o’clock, or 12:15.

To begin with, we’re told that the time is 2 o’clock. How do we know this? Well, we can see that the minute hand on our clock face is pointing right up to the number 12; this tells us it’s an o’clock time. And then, the hour hand is pointing straight at the number two; it’s 2 o’clock. And the question asks us to pick what the time will be in one hour. Now, we’re given three different times to choose from, and these aren’t just any three times. One of them is going to end up being the right answer; we know that. But the other two clocks show times that we could choose by accident if we made certain mistakes.

Let’s go through our possible answers and keep an eye out for those mistakes. We don’t wanna make them, do we? If we look at our first clock face, we can see that it’s another o’clock time. The minute hand is pointing to the 12; this clock shows 1 o’clock. Now, this is one-hour difference from 2 o’clock, isn’t it? Is this the right answer? It’s not, is it? We know that it’s 2 o’clock now. So, 1 o’clock is an hour before this time; it’s been and gone. It was 1 o’clock one hour ago. We need to find the time that’s one hour in the future.

So this clock might be an easy mistake to make if you’re counting in the wrong direction. But we’re not going to make that mistake. We’re going to count onwards from 2 o’clock. In one hour’s time, the minute hand will have gone all the way around the clock back to another o’clock time. But the hour hand will have moved on to the next number. It’s going to be 3 o’clock. Now, here’s where we need to make sure we don’t make a second mistake. We know that when it’s 3 o’clock, one of the hands points to the number 12. That’s an o’clock time. And the other hand points to number three, 3 o’clock.

Can you see what’s similar about our two remaining answers? They both have hands pointing to the 12 and to the three. It would be very easy to choose the wrong clock here. Now, we’ve got digital times written underneath each clock, so we can see which one is 3 o’clock. But even if the digital time wasn’t there, we could tell which clock was correct by looking for the one where the minute hand — that’s the longest hand — is pointing to the 12 and the hour hand — that’s the shorter hand — is pointing to the three. On our last clock, those hands are pointing the other way around, and so it shows 12:15 and not 3 o’clock. If it’s 2 o’clock, the time it will be in one hour will be 3 o’clock.

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