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Telling the time

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CONTENTS

ITEM TYPE NUMBER
Time and the clock Workout 53 slides
Telling the time Library 17 questions
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SAMPLE FROM THE WORKOUT

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SLIDE 1 - QUESTION 1

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SLIDE 2 - SOLUTION

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SAMPLE FROM THE LIBRARY

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QUESTION [difficulty 0.1]

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SOLUTION

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DEPENDENCIES

190: Properties of numbers
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192: Telling the time
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210: Time and time management

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CONCEPTS

ITEM
 LEV.
Hours, minutes and seconds 398.1
Practical calculations with time 398.3
Minutes to fractions of a hour 398.5
1/12 th divisions of the circle 398.7
Additions of fractions of 1/12th of circle 398.9
24 hour clock, am, pm, noon, midnight 399.1
Conversion between 24 and 12 hour clock 399.1
The clockface 399.3
Big hand, little hand, o'clock, on the hour 399.3
Earlier, later 399.6
Half past the hour 400.0
Quarter past the hour, fifteen minutes past the hour 400.5
Quarter to the hour, forty-five minutes past the hour 400.6
Start, end, difference between times 400.9
1/12 of hour = 5 minutes 401.3
Increments of 5 minutes past the hour, to the hour 401.6
Increments of 1 minute past the hour, to the hour 402.5

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Telling the time SLIDE 1 Time is measured in hours, minutes and seconds. There are 60 seconds in a minute, 60 minutes in an hour and 24 hours in a day. ? How many seconds are there in 3 minutes? ? How many minutes are there in 5 hours? ? How many hours are there in 7 days? ? How many seconds are there in 2 minutes 12 seconds? ? How many minutes are there in 9 hours 35 minutes? ? How many hours are there in 4 and a half days? SLIDE 2 ? How many seconds are there in 3 minutes? ? How many minutes are there in 5 hours? ? How many hours are there in 7 days? ? How many seconds are there in 2 minutes 12 seconds? ? How many minutes are there in 9 hours 35 minutes? ? How many hours are there in 4 and a half days? SLIDE 3 ? How many seconds are there in 2 hours 10 minutes? ? How many seconds are there in 1 hour 14 minutes and 51 seconds? ? How many minutes are there in 3 days 8 hours and 24 minutes? ? It takes 15 minutes to iron a shirt. How many hours will it take to iron 12 shirts? ? It takes 10 minutes to make a slide for a presentation. How many hours will it take to make 72 slides? ? At a cafι it takes a waiter 5 minutes to serve a client coffee. How many cups of coffee can a waiter serve in a 3 hour shift? SLIDE 4 ? How many seconds are there in 2 hours 10 minutes? ? How many seconds are there in 1 hour 14 minutes and 51 seconds? ? How many minutes are there in 3 days 8 hours and 24 minutes? ? It takes 15 minutes to iron a shirt. How many hours will it take to iron 12 shirts? ? It takes 10 minutes to make a slide for a presentation. How many hours will it take to make 72 slides? ? At a cafι it takes a waiter 5 minutes to serve a client coffee. How many cups of coffee can a waiter serve in a 3-hour shift? SLIDE 5 ? How many minutes are there in half an hour? ? How many minutes are there in quarter of an hour? ? How many minutes are there in three-quarters of an hour? ? How many minutes are there in of an hour? ? How many minutes are there in of an hour? ? How many minutes are there in of an hour? SLIDE 6 ? How many minutes are there in half an hour? ? How many minutes are there in quarter of an hour? ? How many minutes are there in three-quarters of an hour? ? How many minutes are there in of an hour? ? How many minutes are there in of an hour? ? How many minutes are there in of an hour? SLIDE 7 Divide a circle into (a) 4 and (b) 12 equal parts. SLIDE 8 SLIDE 9 Use the diagram to find ? ? ? SLIDE 10 ? ? ? SLIDE 11 There are 24 hours in one day. The day is divided into two halves. The zero hour is midnight. The twelfth hour of the day is midday, or noon. There are 12 hours before noon. This is the morning. A time before noon is a.m. There are 12 hours after noon. The time coming after noon is the afternoon. A time after noon is p.m. In the 24-hour clock time in the afternoon is measured from the zero hour. Example, 3 p.m. is 15.00 hours. ? What is 5 p.m. in the 24-hour clock? ? What is 11 p.m. in the 24-hour clock? ? What is 7 hours 30 minutes after noon in the 24-hour clock? ? What is 16.00 hours as time pm? ? What is 20.00 hours as time pm? ? What is 21.30 hours as time pm? SLIDE 12 ? What is 5 p.m. in the 24-hour clock? ? What is 11 p.m. in the 24-hour clock? ? What is 7 hours 30 minutes after noon in the 24-hour clock? ? What is 16.00 hours as time pm? ? What is 20.00 hours as time pm? ? What is 21.30 hours as time pm? SLIDE 13 It is two o’clock. A clockface is divided into twelve equal parts, numbered 1 to 12. A clock has a big hand and a little hand. The little hand points to the hour. Since there are only twelve hours marked on the clock, you have to know whether it is am or pm (before noon, or after noon). When the big hand points to the 12 it is on the hour. The little hour points to the hour. When we say “two o’clock” the phrase “o’clock” is short for “of the clock”. This is old-fashioned English, but that is what we still say. SLIDE 14 In each case, what is the hour of the clock? …………………………………………. …………………………………………. …………………………………………. …………………………………………. SLIDE 15 In each case, what is the hour of the clock? It is 5 o’clock It is 6 o’clock It is 8 o’clock It is 12 o’clock SLIDE 16 ? It is 4 o’clock. Draw the clock. ? It is 2 o’clock. Draw the clock, five hours later. ? It is 6 o’clock. Draw the clock, three hours earlier. ? It is 10 o’clock. Draw the clock, four hours later. ? ? ? ? SLIDE 17 ? It is 4 o’clock. ? It is 2 o’clock. 5 hours later it is 7 o’clock. ? It is 6 o’clock. 3 hours earlier it is 3 o’clock. ? It is 10 o’clock. 4 hours later it is 2 o’clock. 4 o’clock 7 o’clock 3 o’clock 5 o’clock SLIDE 18 1 hour is 60 minutes ? How many minutes is half an hour? ? How many minutes is quarter of an hour? ? How many minutes is three-quarters of an hour? SLIDE 19 ? Half an hour is 30 minutes ? Quarter of an hour is 15 minutes ? Three-quarters of an hour is 45 minutes SLIDE 20 It is half past 1 It is “One thirty” It is 1:30 When the big hand points downwards towards the 6 it is half past the hour. This is the same as thirty minutes past the hour. SLIDE 21 What is the time of the day? In each case, what is the hour of the clock? …………………………………………. …………………………………………. …………………………………………. …………………………………………. SLIDE 22 Half past four Half past nine 4:30 9:30 Half past twelve Half past three 12:30 3:30 SLIDE 23 ? It is 11.30 o’clock. Draw the clock. ? It is 4 o’clock. Draw the clock, five hours thirty minutes later. ? It is 2.30. Draw the clock, four and a half hours earlier. ? It is 11 o’clock. Draw the clock, four hours thirty minutes later. ? ? ? ? SLIDE 24 ? It is 11.30 o’clock. ? It is 4 o’clock. 5 hours 30 minutes later it is half past nine, 9:30. ? It is 2.30. Four and a half hours earlier it was 10 o’clock. ? It is 11 o’clock. 4 hours 30 minutes later it is 3:30. Half past eleven Half past nine 11:30 9:30 Half past twelve Half past three 12:30 3:30 SLIDE 25 It is quarter past ten It is fifteen minutes past ten It is “ten fifteen” It is 10:15 When the big hand points downwards towards the 3 it is quarter past the hour. This is the same as fifteen minutes past the hour SLIDE 26 It is a quarter to four It is forty-five minutes past three It is “three forty-five” It is 3:45 When the big hand points downwards towards the 9 it is a quarter to the hour SLIDE 27 What is the time? …………………………………………. …………………………………………. …………………………………………. …………………………………………. SLIDE 28 What is the time? Quarter to seven Quarter past two Six forty-five Two fifteen 6:45 2:15 Quarter past eight Quarter to twelve Eight fifteen Eleven forty-five 8:15 11:45 SLIDE 29 What is the difference between the two times? Start End Start End SLIDE 30 What is the difference between the two times? 5.15 7.30 Difference = 2 hours 15 minutes 2.45 6.15 Difference = 3 hours 30 minutes SLIDE 31 What is the difference between the two times? Start End Start End SLIDE 32 8.15 11.00 Difference = 2 hours 45 minutes 9.00 1.45 Difference = 4 hours 45 minutes SLIDE 33 The clockface is divided into twelve equal parts. These are numbers from 1 to 12. The big hand points to the number of minutes. Each twelfth part of the clockface is 5 minutes. SLIDE 34 The numbers on the outside are the number of minutes corresponding to the numbers on the clockface. Complete the number of minutes. SLIDE 35 SLIDE 36 It is ten past seven It is seven ten 7:10 SLIDE 37 What is the time? …………………………………………. …………………………………………. …………………………………………. …………………………………………. SLIDE 38 Twenty-five past two Twenty minutes to ten Two twenty-five Nine forty 2:25 9:40 Five past five Five minutes to three Five five Two fifty-five 5:05 2:55 SLIDE 39 What is the difference between the two times? start end start end SLIDE 40 6:05 6:25 Difference = 20 minutes 2:50 3:15 Difference = 25 minutes SLIDE 41 What is the difference between the two times? start end start end SLIDE 42 12:35 2:30 Difference = 1 hour 55 minutes 4:50 7:00 Difference = 2 hours 10 minutes SLIDE 43 What is the difference between the two times? start end start end SLIDE 44 4:15 8:55 Difference = 3 hours 40 minutes 10:45 12:20 Difference = 1 hour 35 minutes SLIDE 45 5:16 16 minutes past 5 There are 60 minutes in an hour. SLIDE 46 What is the time? SLIDE 47 2:37 SLIDE 48 What is the time? SLIDE 49 8:12 SLIDE 50 What is the time? SLIDE 51 1:23 8:47 4:04 6:52 SLIDE 52 What is the difference between the two times? start end start end 10:21 11:39 Difference = 1 hour 18 minutes 8:14 11:57 Difference = 3 hours 43 minutes