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Lesson 3: Elapsed time

# Time FAQ

## What do the different hands on a clock mean?

On a clock there are two hands. The $\text{hour hand}$ is the shorter hand. The $\text{minute hand}$ is the longer hand.

## How do I read a clock?

First, we need to look at the hour hand. The hour hand is between $1$ and $2$, so it is after $1$ o'clock but not yet $2$ o'clock.
So, the hour is $1$. Next, we look at the minute hand.
The minute hand starts pointing straight up for $0$ minutes.
When counting minutes, the distance between each tick mark represents $1$ minute.
Each number on the clock represents $5$ minutes, with a total of $60$ minutes in each hour.

## How can a number line help us find elapsed time?

If we unroll a clock, it becomes a number line! We can set up a number line to represent minutes in an hour. Then, we can mark the start time and end time of an event, and count the number of minutes between the two marks.
To find out how many minutes are between $9:18$ to $9:57$, we can find the distance from $9:18$ to $9:57$.

## Why do we need to know how to calculate elapsed time?

Knowing how to calculate elapsed time helps us understand how long it takes to do certain things, like driving to a new place or completing a task.

## How can we use what we learned in this unit in the real world?

Time is an important part of our lives, so this unit has many real-world applications. We can use what we learned to keep appointments, plan our day, and understand how long things take.

## Want to join the conversation?

• why do you go arond the clock 2 times ?
• Because there are 24 HOURS in 1 DAY so 12 plus 12= 24, and they are both split into P.M. and A.M.
• why do we need digital clock
• To measure time accurately.

Analog Clocks are easily affected by external factors, for example, the cogwheel of the clock may rust, leading to a slower or faster time.

Digital Clocks don't use cogwheel, but instead computer chips, so under most situation, it is more accurate.
• I need help with times.
• i can help you just tell me when you need it
• can I get help please.
• you can get help reach out to me and i will help you!!
• why do we have time
• So we know what time it is
• How do I remember all this when the time comes to use the knowledge?