Summer Term Week 1 Year 4 Learning Sequence

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Summer Term Week 1 Year 4 Learning Sequence 26 Lesson 3 (1 Hour) Time

Summer Term Week 1 Year 4 Learning Sequence 26 Lesson 3 (1 Hour) Time – Read, write, calculate and convert time on analogue and digital 12 -hour and 24 -hour clocks

Objective: To find start times when the duration is known.

Objective: To find start times when the duration is known.

Starter • Last lesson we were calculating how long things took to do. We

Starter • Last lesson we were calculating how long things took to do. We call this – duration. • Today we are going to see if we can work out when an activity started by working backwards from the ending time.

Firstly, let’s remember what we did last lesson: The start time and the duration

Firstly, let’s remember what we did last lesson: The start time and the duration are known, the end time needs to be worked out. Read through this and make sure you understand it.

Your turn: What is the time 3 hours and 45 minutes later than 21:

Your turn: What is the time 3 hours and 45 minutes later than 21: 35? Draw a counting frog to help you jump forward in time. (Remember there are only 60 minutes in an hour)

What is the time 3 hours and 45 minutes later than 21: 35? Draw

What is the time 3 hours and 45 minutes later than 21: 35? Draw a counting frog to help you jump forward in time.

01: 20 9: 35 pm + 3 hours = 12: 35 am + 45

01: 20 9: 35 pm + 3 hours = 12: 35 am + 45 mins = 1: 20 am

Now try these • This was the time that Sean arrived at the park.

Now try these • This was the time that Sean arrived at the park. His mum said he had to leave after 2 hours and 45 minutes. What time did Sean have to leave the park? • A band played. They started at 22: 50 and played for an hour and a half. At what time did the band finish playing?

Now let’s try it backwards! What time did the activity start? • A quick

Now let’s try it backwards! What time did the activity start? • A quick cricket match ended at 16: 40 and players played for 1 hour and 10 minutes. What time did the match start? • Try to count back carefully and see if you can find the start time.

Which of these ways do you prefer? Can you see how the counting frog

Which of these ways do you prefer? Can you see how the counting frog helps.

Your turn 1. If my clock is an hour and 35 minutes slow. What

Your turn 1. If my clock is an hour and 35 minutes slow. What time is it actually? 2. Peter and Paul are meeting at the cinema. The film starts at 15: 10. They decide to meet 35 minutes earlier. What time do they agree to meet? 3. What is 25 minutes earlier than 23: 15?

Extra challenge! These will stretch you. Make sure you prove you are right by

Extra challenge! These will stretch you. Make sure you prove you are right by checking you answer by inversing the calculation. 1. Ben’s birthday sleepover started on 23 rd April at 19: 45. His mum’s 40 th birthday party started 18 and a half hours later. Write at least two possible party invitations with dates and times on each for guests. 2. When it is 7 a. m. in London, it is 8 a. m. in Paris. The train website states that the London to Paris train arrives in Paris at 14: 37. It takes 3 hours 48 minutes. At what time did the train leave London (local time)?

AFL What is 1 hr 30 earlier than these times? Write them using the

AFL What is 1 hr 30 earlier than these times? Write them using the 24 hour clock 12: 45 22: 10 13: 35

Answers slide 1. 11: 35 2. 14: 35 or 2: 35 pm 3. 22:

Answers slide 1. 11: 35 2. 14: 35 or 2: 35 pm 3. 22: 50 or 10: 50 pm Extension 1. Invites should show the date and time as either 2: 15 pm on 24 th April or 14: 15 on 24 th April. 2. The train left London at 09: 49 or 9: 49 am 3. AFL answers: 11: 15 20: 40 12: 05