Year 2: Timetables and how long things last
Part of the Year 2 time chapter. Chapter overview · whole chapter on one page
Timetables and how long things last
A timetable shows when things start. Some things last for a set time.
To find the end time, add the time it lasts to the start time.
If something lasts 1 hour, the hour goes on by 1. The minutes stay the same.
Always check that your end time comes after the start time.
Key ideas
- Read the start time and how long it lasts.
- Count on to find the end time.
- One hour later, the hour goes on by one.
- Check: the end time comes after the start time.
Method. Start at the start time. Add the length of the event.
- Start at the start time. Put your finger on the start time.10:00
- Add 1 hour. Count the hours first. Then count the minutes.10:00 + 1 hour = 11:00
- Write the end time. Write the hour, a colon, then the minutes.11:00
Check. Count back 1 hour from 11:00 to get 10:00. ✓
Watch out. When the minutes pass 60, the hour changes. Do not write 4:60.
Method. Count on from the first time to the second time. Count the minutes.
- Start at the first time. Put your finger on the first time.9:15
- Count on to 10. Count the minutes to the next hour first.60 − 15 = 45
- Count on to 10:00. Then add the minutes past 10.45 + 0 = 45
- Write the answer. 45
Check. Count back: 45 minutes on from 9:15 reaches 10:00. ✓
Watch out. Count on to the next hour first. Then count on the minutes.
Method. Start at the start time. Add the length of the event.
- Start at the start time. Put your finger on the start time.3:20
- Add 20 minutes. Count the hours first. Then count the minutes.3:20 + 20 minutes = 3:40
- Write the end time. Write the hour, a colon, then the minutes.3:40
Check. Count back 20 minutes from 3:40 to get 3:20. ✓
Watch out. When the minutes pass 60, the hour changes. Do not write 4:60.
Watch out
Watch out: 1 hour after 4:30 is 5:30, not 4:60. The hour changes and the minutes stay the same.
Exam tip
Grown-up tip. Use a real timetable, like a bus or swimming timetable. Ask: “When does it start? How long does it last? When does it finish?” Count on in fives on a clock together.
Exercise 7F Timetables and end times
Non-calculatorMethod. Start at the start time. Add the length of the event.
- Start at the start time. Put your finger on the start time.2:00
- Add 1 hour. Count the hours first. Then count the minutes.2:00 + 1 hour = 3:00
- Write the end time. Write the hour, a colon, then the minutes.3:00
Check. Count back 1 hour from 3:00 to get 2:00. ✓
Watch out. When the minutes pass 60, the hour changes. Do not write 4:60.
Method. Start at the start time. Add the length of the event.
- Start at the start time. Put your finger on the start time.5:00
- Add 30 minutes. Count the hours first. Then count the minutes.5:00 + 30 minutes = 5:30
- Write the end time. Write the hour, a colon, then the minutes.5:30
Check. Count back 30 minutes from 5:30 to get 5:00. ✓
Watch out. When the minutes pass 60, the hour changes. Do not write 4:60.
Method. Start at the start time. Add the length of the event.
- Start at the start time. Put your finger on the start time.9:00
- Add 15 minutes. Count the hours first. Then count the minutes.9:00 + 15 minutes = 9:15
- Write the end time. Write the hour, a colon, then the minutes.9:15
Check. Count back 15 minutes from 9:15 to get 9:00. ✓
Watch out. When the minutes pass 60, the hour changes. Do not write 4:60.
Method. Start at the start time. Add the length of the event.
- Start at the start time. Put your finger on the start time.1:45
- Add 15 minutes. Count the hours first. Then count the minutes.1:45 + 15 minutes = 2:00
- Write the end time. Write the hour, a colon, then the minutes.2:00
Check. Count back 15 minutes from 2:00 to get 1:45. ✓
Watch out. When the minutes pass 60, the hour changes. Do not write 4:60.
Method. Count on from the first time to the second time. Count the minutes.
- Start at the first time. Put your finger on the first time.1:30
- Count on to 2. Count the minutes to the next hour first.60 − 30 = 30
- Count on to 2:00. Then add the minutes past 2.30 + 0 = 30
- Write the answer. 30
Check. Count back: 30 minutes on from 1:30 reaches 2:00. ✓
Watch out. Count on to the next hour first. Then count on the minutes.
Method. Start at the start time. Add the length of the event.
- Start at the start time. Put your finger on the start time.12:00
- Add 1 hour. Count the hours first. Then count the minutes.12:00 + 1 hour = 1:00
- Write the end time. Write the hour, a colon, then the minutes.1:00
Check. Count back 1 hour from 1:00 to get 12:00. ✓
Watch out. When the minutes pass 60, the hour changes. Do not write 4:60.
Method. Start at the start time. Add the length of the event.
- Start at the start time. Put your finger on the start time.2:00
- Add 30 minutes. Count the hours first. Then count the minutes.2:00 + 30 minutes = 2:30
- Write the end time. Write the hour, a colon, then the minutes.2:30
Check. Count back 30 minutes from 2:30 to get 2:00. ✓
Watch out. When the minutes pass 60, the hour changes. Do not write 4:60.
Method. Start at the start time. Add the length of the event.
- Start at the start time. Put your finger on the start time.7:15
- Add 15 minutes. Count the hours first. Then count the minutes.7:15 + 15 minutes = 7:30
- Write the end time. Write the hour, a colon, then the minutes.7:30
Check. Count back 15 minutes from 7:30 to get 7:15. ✓
Watch out. When the minutes pass 60, the hour changes. Do not write 4:60.
Method. Start at the start time. Add the length of the event.
- Start at the start time. Put your finger on the start time.9:45
- Add 15 minutes. Count the hours first. Then count the minutes.9:45 + 15 minutes = 10:00
- Write the end time. Write the hour, a colon, then the minutes.10:00
Check. Count back 15 minutes from 10:00 to get 9:45. ✓
Watch out. When the minutes pass 60, the hour changes. Do not write 4:60.
Method. Count the hours from 2 o’clock to 5 o’clock.
- Start at 2:00. The park visit starts at 2 o’clock.2:00
- Count the hours to 5:00. Each jump from one hour to the next is 1 hour.2 → 3 → 4 → 5 is 3 jumps
- Write the answer. There are 3 hours from 2 o’clock to 5 o’clock.3 hours
Check. 2 hours on from 3 o’clock is 5 o’clock, so 3 hours is right. ✓
Watch out. Count the hours, not the minutes, when the times are on the hour.
Method. Work out the time, then decide if the claim is right.
- Work it out. Use the clock or the numbers.6:45 to 7:00 is 15 minutes, which is a quarter of an hour.
- Compare with what is said. Ben says the film lasts 1 hour.It does not match
- Decide. From 6:45 to 7:00 is 15 minutes, not 1 hour, so Ben is not right.No
Check. Check it again: 6:45 to 7:00 is 15 minutes, which is a quarter of an hour.. ✓
Watch out. Check the hour and the minutes, not just one of them.
Method. Work out the time, then decide if the claim is right.
- Work it out. Use the clock or the numbers.2 hours is 120 minutes, and 120 + 30 = 150 minutes.
- Compare with what is said. Tia says 2 hours and 30 minutes is 150 minutes.It matches
- Decide. 2 hours and 30 minutes is 150 minutes, so Tia is right.Yes
Check. Check it again: 2 hours is 120 minutes, and 120 + 30 = 150 minutes.. ✓
Watch out. Check the hour and the minutes, not just one of them.
Method. Start at the start time. Add the length of the event.
- Start at the start time. Put your finger on the start time.3:50
- Add 20 minutes. Count the hours first. Then count the minutes.3:50 + 20 minutes = 4:10
- Write the end time. Write the hour, a colon, then the minutes.4:10
Check. Count back 20 minutes from 4:10 to get 3:50. ✓
Watch out. When the minutes pass 60, the hour changes. Do not write 4:60.