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Maths
Summary
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.
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 |
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 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.
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 $2^{nd}.$
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
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