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How are integers used to model real-world situations?

ok so my teacher is giving us a journal to do in math!!! Why are integers important?? what are the procedures to solving integers?? what is an illustration of the daily use of integers??

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1. integers play roll in your life daily ,5$ , -2degreescintigrade,below sea level 394m (dead sea between palestine and jordan) -394m ,in your building up 3 floors,down 2 floors,etc procesdures addition ,subtactring,multiplying,divisin ,etc
2. Integers are whole numbers both positive and negative. Integers don't have decimals or fractions in them. They are important because we use integers(numbers) almost every day in life. If you go to the store and buy something and you get change. Your using integers. Unless the change has cents in it, then its not an integer. The procedure for solving integers is simple. For example, you buy something that is five dollars and you have ten dollars. You give the cashier the bill and get five dollars back. All of the numbers i used were integers and i used them to solve the problem. And the last question, the daily use of integers can be the price of something, the weight of something, the size of something, etc. I hoped this helped you.
3. Firstly we need to have a definition of what integers are. Integers are whole numbers (positive and negative). They also belong to the set of rational numbers in that any integer n can be expressed as n/1. A rational number is any number that can be expressed in terms of p/q where p and q are both integers (q not equal to 0). Furthermore, both integers and rational numbers belong to an even bigger set; the set of irrational numbers, which cannot be expressed in terms of p/q as explained above. Examples of irrational numbers are sqrt(2) and the number PI (Ask your teacher about this). All of these types of numbers constitute the set of real numbers. There is a set of complex numbers which have what are called real and imaginary components, but this concept would be outside the scope of your current learning. The importance of integers is mainly in counting and although they are used in measurement, they are not unique in this respect, since all rational numbers and irrational numbers are better suited. Like other types of numbers, mathematical operations on integers include addition, subtraction, multiplication and division. Although with division, unless the divisor is a proper factor of the quotient, the result will not be an integer but a fraction. Another opertion of interext is modular arithmetic which deals with remainders. For example, 23 = 37 (mod 7) since both numbers have a remainder of 2 when divided by 7 (The '=' sign is not quite right. It should be an equivalence sign of three lines, but unfortunately I cannot type that here) Integers are very important in a field of mathematics called combinatorics. This is a discipline which determines how many ways there are of choosing some number of objects from another number of objects amongst other things. For example if there were 30 children in your class, you might want to know how many ways there are of dividing up all of the students into pairs (No, the answer's not 15, but 435) There are many uses for integers in daily life, not least in news bulletins which report on unemployment figures or budget deficits. Parents going shopping also need to have an aptitude for integers when working out how much food to get in for their families. As I said previously, the uses are many.