Introduction Time is difficult to define but it happens all day every day By keeping track of time we know when to get up in the morning when summer vacation starts and when to buy presents for an upcoming holiday Time is so vast that in order to deal with it human beings have to divide it up into small portions years weeks months hours minutes seconds Time is happening all the time
In this book we will look at all of those time segments You will also learn how much math can be done with time Great Stem Grandparent Birth 1927 Death 1965 in Action Have you ever made a family timeline It can be a fun project to work on with your parents and siblings A family timeline shows when each person in the family was born Depending on how far back you want to go you can even show grandparents and great grandparents Grandparent Birth 1947 Parent Birth 1967 Let's imagine some dates For instance say you were born in 2001 Picture your family timeline If you had a relative who died in 1965 how many years passed between that person's death and your birth Child Birth 2001 You can find out by subtracting the smaller number from the larger number 2001 1965 36 There were 36 years between your relative's death and your
Using Clocks Clocks are all around us Some clocks are part of something else like the clock in an automatic coffee maker Some clocks are so big that they become symbols of an entire country like Big Ben in London England You may even be wearing a clock on one of your wrists in the form of a watch One of the most famous analog clocks in the world is Big Ben At what time was this picture of Big Ben taken
STEM in Action Clocks are also a good example of how people use math every single day Most of the clocks that people see and use today are digital All this means is that digital clocks display only the digits needed to express the correct time Not long ago though another kind of clock was popular It was the analog clock Let's say that you have an appointment with the dentist at 4 30 p m Now imagine that the current time is 1 00 p m How much time do you have until your appointment with the dentist 4 30 1 00 3 30 You have 3 hours and 30 minutes until your dentist appointment Digital clocks like this one display the numbers of the individually time
