If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

Lesson 8: Converting units of time

# Converting units of time review (seconds, minutes, & hours)

Review the size of seconds, minutes, and hours and how to convert between them.  Then, try some practice problems.

### Units of time

Units of time measure how long something lasts. For example, how many seconds can you hold your breath, or how many minutes long is your favorite movie?

## How long are different units?

A second is a short amount of time. It takes about 1 second to turn on a light or open the refrigerator door.
A minute is equal to 60 seconds. It takes about 1 minute to brush your teeth.
An hour is equal to 60 minutes. Extracurricular activities (gymnastics, piano lessons, soccer practice) often last about 1 hour.

## Practice set 1: Estimating time

Problem 1A
• Current
Identify the most reasonable unit to measure the time it takes to bake a pan of cookies.

Want to try more problems like this? Check out this exercise.

## Converting larger units to smaller units

1, start text, space, m, i, n, u, t, e, end text, equals, start color #1fab54, 60, end color #1fab54, start text, space, s, e, c, o, n, d, s, end text
1, start text, space, h, o, u, r, end text, equals, start color #1fab54, 60, end color #1fab54, start text, space, m, i, n, u, t, e, s, end text
To convert larger units to smaller units we multiply the number of larger units by start color #1fab54, 60, end color #1fab54.
Example: Converting hours to minutes
1, start text, space, h, o, u, r, end text, equals, start color #1fab54, 60, end color #1fab54, start text, space, m, i, n, u, t, e, s, end text
start color #11accd, 6, end color #11accd, start text, space, h, o, u, r, s, end text, equals, start color #11accd, 6, end color #11accd, times, start color #1fab54, 60, end color #1fab54, equals, 360, start text, space, m, i, n, u, t, e, s, end text

## Converting smaller units to larger units

To convert smaller units to larger units we divide the number of smaller units by start color #1fab54, 60, end color #1fab54.
1, start text, space, s, e, c, o, n, d, end text, equals, start fraction, 1, divided by, start color #28ae7b, 60, end color #28ae7b, end fraction, start text, space, m, i, n, u, t, e, end text
1, start text, space, m, i, n, u, t, e, end text, equals, start fraction, 1, divided by, start color #28ae7b, 60, end color #28ae7b, end fraction, start text, space, h, o, u, r, end text
Example: Converting seconds to minutes
1, start text, space, s, e, c, o, n, d, end text, equals, start fraction, 1, divided by, start color #28ae7b, 60, end color #28ae7b, end fraction, start text, space, m, i, n, u, t, e, end text
start color #ff00af, 30, end color #ff00af, start text, space, s, e, c, o, n, d, s, end text, equals, start fraction, start color #ff00af, 30, end color #ff00af, divided by, start color #28ae7b, 60, end color #28ae7b, end fraction, equals, start color #6495ed, start fraction, 1, divided by, 2, end fraction, end color #6495ed, start text, space, m, i, n, u, t, e, end text

## Practice set 2: Converting units of time

Problem 2A
• Current
Convert.
11 minutes equals
seconds

Want to try more problems like this? Check out these exercises:
Convert larger units to smaller units
Converting between units