Timetables and time intervals
🎯 In this topic you will
- Read and interpret a timetable in order to solve practical problems.
- Choose and use suitable units to calculate time intervals accurately.
🧠 Key Words
- calendar
- leap year
- time interval
- timetable
Show Definitions
- calendar: A system used to organise days, weeks, and months in a year.
- leap year: A year with 366 days, including an extra day in February, used to keep calendars accurate.
- time interval: The amount of time between two given times or events.
- timetable: A table that shows times at which events, such as lessons or journeys, happen.
Why Knowing the Time Matters ⏰
I t is important to know how to tell the time and be able to read a calendar and a timetable. This skill helps you plan your day and understand when things will happen.
Being on Time for Important Events 🚆
U nderstanding time and timetables helps you arrive on time for important events, such as catching a train, bus, plane, or boat. If you misread the time, you might arrive just as it is leaving.
❓ EXERCISES
$1$. Heidi went to her friend’s house.
She arrived at $2.00$ p.m. and left at $2.45$ p.m.
How long was Heidi at her friend’s house?
👀 Show answer
$2$. The swimming pool opens at $8.00$ a.m.
It closes at $6.00$ p.m.
How long is the pool open?
👀 Show answer
$3$. The time is $9.25$ a.m.
Haibo says, ‘The time is closer to $09{:}00$ than to $10{:}00$.’
Explain why Haibo is correct.
👀 Show answer
$4$. These are the opening times of a museum.
| Day | Opening times |
|---|---|
| Monday | Closed |
| Tuesday to Friday | $10.30$ a.m. to $5.30$ p.m. |
| Saturday | $9.00$ a.m. to $6.00$ p.m. |
| Sunday | $11.00$ a.m. to $4.00$ p.m. |
a. How many hours is the museum open on Wednesday?
b. Zina arrived at the museum at $3.15$ p.m. on Sunday.
How long could she stay before closing time?
👀 Show answer
a. On Wednesday (Tuesday to Friday), it is open from $10.30$ a.m. to $5.30$ p.m., which is $7$ hours.
b. On Sunday it closes at $4.00$ p.m. From $3.15$ p.m. to $4.00$ p.m. is $45$ minutes, so she could stay $45$ minutes.
$5$. Here is part of a bus timetable from Dondale to Bodmin.
| Stop | $12{:}12$ | $12{:}31$ | $12{:}48$ | $13{:}02$ |
|---|---|---|---|---|
| Dondale | $12{:}12$ | $12{:}31$ | $12{:}48$ | $13{:}02$ |
| Knightsbridge | $12{:}21$ | $12{:}38$ | $12{:}55$ | $13{:}11$ |
| Bridgetown | $12{:}38$ | $12{:}52$ | $13{:}11$ | $13{:}28$ |
| Treham | $12{:}44$ | $13{:}00$ | $13{:}17$ | $13{:}36$ |
| Bodmin | $13{:}01$ | $13{:}17$ | $13{:}34$ | $13{:}53$ |
a. How many minutes does it take the $13{:}02$ bus from Dondale to reach Bodmin?
b. Magda is at Bridgetown at $1$ p.m.
What is the earliest time she can reach Treham?
Check your answers with your partner.
👀 Show answer
a. The $13{:}02$ bus reaches Bodmin at $13{:}53$. Time taken is $53 - 2 = 51$ minutes, so it takes $51$ minutes.
b. At $1$ p.m. ($13{:}00$), the next bus from Bridgetown is at $13{:}11$. That bus reaches Treham at $13{:}17$, so the earliest time is $1{:}17$ p.m. ($13{:}17$).
$6$. The Golden Gate Bridge in San Francisco was opened on $27$ May $1937$.
Jyoti visits the bridge on $27$ May $2020$.
How many years has the bridge been open?
👀 Show answer
$7$. Here is a timetable for Class $4$ on Tuesday.
a. How long does Assembly last?
b. How long does morning break last?
c. Hassan’s favourite lessons are Maths and Science.
How long is spent, in total, in these two lessons?
👀 Show answer
a. Assembly runs from $09{:}15$ to $09{:}35$, so it lasts $20$ minutes.
b. Morning break runs from $10{:}35$ to $10{:}50$, so it lasts $15$ minutes.
c. Maths is $10{:}50$ to $11{:}50$ ($60$ minutes) and Science is $13{:}30$ to $14{:}30$ ($60$ minutes). Total time is $60 + 60 = 120$ minutes, which is $2$ hours.
🧠 Think like a Mathematician
a. Leila goes swimming each day from Monday 2 December to Friday 6 December.
How many days does she go swimming?
b. Ahmed joins a gym club from 1 April to 30 June.
How many months is this?
c. Ros works on a project from Wednesday 11 September to Tuesday 8 October.
How many weeks does she work on the project?
👀 show answer
- a. From Monday to Friday inclusive is 5 days.
- b. From 1 April to 30 June covers April, May, and June, which is 3 months.
- c. From 11 September to 8 October is 27 days, which is just under 4 weeks (that is, 3 weeks and 6 days).