Exciting news, everyone. Mr Green has invented a time machine! Would you like to see it? Alright, it looks like a telephone box on the outside (I know, parents, a very original concept!), but inside it is actually a time machine! Look! Alright, that may look like an old fashioned telephone, but actually if you press the right numbers then you get to travel in time. You’ll just have to take my word for it.
Now, Mr Green needs your help. His watch is still set to the time that it is now. But when he goes forward or backwards in time, he’ll need to know what time to reset his watch to. Can you help? Let’s say it is ten o’clock in the morning (10:00am) at the moment. If Mr Green went forward in time (to the future) one hour, what time would it be now? Yes, that’s right, eleven o’clock in the morning (11:00am). What if Mr Green travelled backwards in time one hour instead? Yes, absolutely spot on, nine o’clock in the morning (09:00am). Can you work out what time Mr Green should change his watch to if he chooses to go to the following times? (Remember, after the hour of twelve o’clock midday, we go to one o’clock in the afternoon) Two hours in the future. Two hours in the past. Three hours in the future. Three hours in the past. Five hours in the future. Five hours in the past. Nine hours in the future. Nine hours in the past. Twelve hours in the future. Twelve hours in the past. Twenty four hours in the future. Twenty four hours in the past. Greater depth time machine challenge Mr Green presses a few buttons and returns to 10am. His controls jam, which means they stop working as well as they should. Now he can only jump forward in time in fifteen minute jumps. One hour can be broken up into four fifteen minute jumps. You have on the hour (“o’clock”), “quarter past” the hour, “half past” the hour and “quarter to” the next hour. Mr Green wants to skip forward to his lunchtime, which is half past twelve. How many fifteen minute jumps does he need to make? Starting from half past twelve, he wants to skip forward to his tea time, which is quarter past five. He skips forward three jumps. How many more jumps does he need to make?
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