Any five you like: it's largely down to perspective, and periods are just a method of dividing still longer spans into slighly more managable chunks distinguished from one another according to some more-or-less subjective set of criteria. European periodisation of the past two millennia is pretty meaningless in China, where more people lived throughout. Europe at the end of its own Middle Ages bore little political, social or economic resemblance to the continent at the start of the period; the same applies to a far greater extent to the modern age.
The three periods of Roman history were the monarchy, the republic and the principate. They were divided this way by the types of government in those periods.
Chronological Thinking
The Old Stone Age, the Stone Age, and the Prehestoric Age
The republican period ie prior to Julius Caesar becoming dictator,and the imperial age which started with two triumvirates and then a succession of emperors
History can be divided into many periods in many different ways, depending on what you are interested in and on how wide or narrow a focus you apply. For example, you could define history (and pre-history) as the stone age, the copper age, the bronze age, the iron age, and the steel age; or you could define it as ancient, middle ages, renaissance, and modern. Or you could focus on a region, such as the Americas, and define periods as Pre-Columbian, colonial, post-colonial and modern. Or you could focus on one country and look at periods specific to the history of that country. For England, for example, they might include the pre-Roman period, the Roman period, the Saxon period, the Plantagenet dynasty, the Tudor Period, the Stuart period, the Victorian age, or several other overlapping designations.
That is the only way they can record radical changes that separate periods.
To make it easier to study
The periods used to divide world history by historians are the Middle Ages, Late Middle Ages, Dark Ages, Stone Age, Iron Age, Bronze Age, pre-war, post-war, and many others to mark events, prehistory, and notable periods.
Probably because it helps to easily identify different time periods in history that hadsimilar events taking place.
Historians divide ancient Egypt's history into three periods: the Old Kingdom, the Middle Kingdom, and the New Kingdom.
Historians divide ancient Egypt's history into three periods: the Old Kingdom, the Middle Kingdom, and the New Kingdom.
Five periods of chemistry
Probably because it helps to easily identify different time periods in history that hadsimilar events taking place.
History is typically divided into three main parts: ancient history, medieval history, and modern history. These divisions are not strict, and historians may further divide each of these periods into more specific subcategories based on time, region, or theme.
periods
700 Divide by two. 350,2 Divide by two. 175,2,2 Divide by five. 35,5,2,2 Divide by five. 7,5,5,2,2 Stop.
375 Divide by three. 125,3 Divide by five. 25,5,3 Divide by five. 5,5,5,3 Stop.