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PORTIONS OF TIME

Portions of Time

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Tips to solve problems that involve portions of time:

1. Start by thinking about the time conversion.

2. Remember that "of" means multiplication.

3. Ask yourself at the end "Does the answer make sense?" If it doesn't make sense, you probably did something wrong.

Let's take a look at some examples:

Example 1

How many hours are in

of a day?

Solution:

There are 24 hours in a day.

So if there are 24 hours in a day and we need to find how many hours are in

of a day, we need to figure out what is

of 24.

Remember that "of" means multiplication.

So,

of 24 is the same as

times 24.

x 24 =

= 6

Remember that there's an understood 1 underneath the 24 and that to multiply fractions you must multiply the numerators then the denominators. At the end, 24 divided by 4 is 6.

Answer: 6 hours.

Example 2

How many years are in

of a century?

Solution:

There are 100 years in a century.

So, if there are 100 years in a century and we need to find how many years are in

of a century, we need to figure out what is

of 100.

Remember that "of" means multiplication.

So,

of 100 is the same as

times 100.

Let's solve this.

x 100 =

100

300

= 75

Remember that there's an understood 1 underneath the 100, and that to multiply fractions you must multiply the numerators then the denominators. At the end, 300 divided by 4 is 75.

Answer: 75 years

Example 3

Mark practiced playing the piano for

of an hour. How many minutes make

of an hour?

Solution:

There are 60 minutes in an hour.

So if there are 60 minutes in an hour and we need to find out how many minutes are in

of an hour.

We need to determine what is

Remember that "of" means multiplication.

So,

of 60 is the same as

times 60.

Let's solve this:

x 60 =

120

= 24

Remember that there's an understood 1 underneath the 60, and that to multiply fractions you must multiply the numerators then the denominators. At the end, 120 divided by 5 is 24.

Answer: 24 minutes.

Portions of Time

Time conversions:

60 seconds = 1 minute
60 minutes = 1 hour
24 hours = 1 day
7 days = 1 week
12 months = 1 year
52 weeks = 1 year
365 days = 1 year (366 for leap year)
10 years = 1 decade
100 years = 1 century
1000 years = 1 millennium

Conversion rule:

Large to small: Multiply

Small to large: Divide

Quick tips for solving 'portions of time' problems:

Start by thinking about the time conversion.
Remember that "of" means multiplication.
Ask yourself at the end "Does my answer make sense?" If it doesn't make sense, you probably did something wrong.