This link (BBC birth estimator) from the BBC is a really cool tool for a classroom to talk about both population and large numbers. If you enter your birthdate into the page it will tell you where you fit into the 7 billion people in the world and also tell you the number you are in all the people who have lived on earth. This amazing tool would be a great discussion for problem solving in the classroom (what information would you need to determine your order in the human population) and also great for reading large numbers.
The site uses the UN Population Division figures. The first number (your place on earth) is an estimate of how many people were alove on your date of birth. This is one possible value based on the global fgures and estimates of growth rates over time. The website states that figures before 1950 are less accurate than those afterwards.
The second number includes calculations based on the methodology of scholar Carl Haub who estimated how many people had been alive since 50,000 B.C.
The site estimates that I was the 4,609,122,666th person alive on Earth and the 79,292,593,536th person to have lived since history began.
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