Chapter overview Maths

Number and place value

Multiplication and division

Fractions

Measurement

Geometry - properties of shapes

Statistics

Maths

# Units of time 0%

Summary

# Units of time

## ​​In a nutshell

The units used on a daily basis are the second, minute and hour.  In order to consider time frames greater than this, use days, weeks, months and years.

## Hours, minutes and seconds

 Unit Conversion Example Hours ​$1$ hour = $60$ minutes​ School lessons typically last an hour Minutes ​$1$ minute = $60$ seconds​ Brushing your teeth should take two minutes Seconds - A heartbeat lasts a second

##### Example 1

How many seconds are in $2$ hours and $3$ minutes?

$2 \text{ hours}$ = $2 \times 60$ = $120 \text{ minutes}$

$120+3 = 123 \text{ minutes}$

$123 \times 60 = \underline{7380 \text{ seconds}}$

## Days, weeks, months and years

Days and weeks are constant units of time. Use the following equations to convert between units:

$1$ day = $24$ hours

$1$ week = $7$ days

Unlike days and weeks, months and years can vary in how long they are:

 Months Duration (days) January, March, May, July, August, October, December ​$31$​​ April, June, September, November ​$30$​​ February* ​$28$​​

*On leap years, February has $29$​ days instead. This means that leap years last $366$​ days, while non-leap years last $365$​ days.

##### Example 2

How many days are between March $18^{th}$ and September $2^{nd}$?

Calculate how many days are left in March:

$31-18=13$​​

Calculate how many days make up the months between March and September:

$30 + 31 + 30 + 31 + 31 = 153$​​

Add the previous two values to the number of days in September:

$13 + 153 + 1 = \underline{167 \text{ days}}$

Note: As the question asked 'between', you do not need to include September $2^{nd}.$

## Want to find out more? Check out these other lessons!

Comparing times

FAQs

• Question: Are years the longest unit of time?

Answer: There are other units of time such as decades, centuries and millennia which are longer than years.

• Question: When are leap years?

Answer: Leap years occur once every 4 years, and so they will be on the years 2024, 2028, and so on.

• Question: What unit should be used for time?

Answer: The base unit of time is the second (s).

Theory

Exercises