Adding Times


1. Tom fell asleep when the time on his clock read 7:35. If he was asleep for 1 hour 40 minutes, work out in your head what time was on the clock when he woke up. 7:35 + 1:40 =


7:35 + 1:00 = 8:35


2. Work these times out in your head. a) 1:55 + 1:10 d) 1:20 + 2:55


8:35 + 0:25 = 9:00 Now just work out how many minutes are left to add on to get the correct time.


b) 2:45 + 1:30 e) 2:15 + 3:50


c) 3:35 + 2:45 f) 5:55 + 4:25


Cinemagic 3. a) Work out what time each fi lm ended. b) Write the starting time and the fi nishing time of each fi lm in the 24-hour system.


c) If the cinema put on The Secret Room again at 11:50pm, at what time would it fi nish?


d) If an earlier show of Supercat fi nished at 8:54pm, at what time did it start? Screen Film 1 2 3 4


The Secret Room Sleepwalkers


Starting Time Duration 8:15pm


Attack of the Deadly Carrots 7:55pm Supercat


9:25pm 11:40pm


Puzzler Susan, Jane and Kevin work in different shops in the shopping centre. Susan gets a break every 120 minutes, Jane gets a break every 180 minutes and Kevin gets a break every 360 minutes. If they each work from 9:00am to 5:00pm, will they all have a break at the same time? If yes, at what time?


4. Now try these.


a) hrs mins 1 27 2 38


+


e) hrs mins 2 19 1 36 3 24


+ 56 Time


b) hrs mins 4 39 1 26


+


f) hrs mins 1 45 3 27 1 18


+


c) hrs mins 2 13 4 57


+


g) hrs mins 3 28 2 49 4 55


+


d) hrs mins 5 46 2 56


+


h) hrs mins 4 53 1 37 6 47


+


2 hrs 28 mins 2 hrs 17 mins 1 hr 49 mins 1 hr 57 mins


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