Put reading, estimating and multiplying big numbers together, and test yourself.
Preview · progress not saved — Chapter 1 is free
Tick what you can now do after this chapter.
Questions from easy to hard across the chapter.
Which of the following values is exactly equal to 1 million?
Find the number names with the most letters.
The number 10,30,285 in words is 'Ten lakhs thirty thousand two hundred eighty five', which has 42 letters. Using your knowledge of English number names (e.g., 'seventy', 'three', 'eight'), construct a 7-digit number that uses the maximum possible number of letters.
State what you are looking for.
Identify which digits give the longest English words.
Combine your longest words into a 7-digit structure.
Count the letters in your proposed number name.
State the final number and its total letter count.
Verify your number meets the criteria.
Estimate what a million coins would look like.
Make necessary reasonable assumptions and answer the question: Can you count 1 million coins in a day? Assume you can count exactly 1 coin every second without stopping.
State your conclusion clearly.
Show the calculation for how many seconds exist in a 24-hour day, and compare it to 1,000,000.
Consider practical limitations beyond pure math.
What surprised you most about big numbers?
This chapter explored massive quantities, from the distance to the sun, to the water in the Amazon river, to trying to fit the population of Mumbai into buses. Reflect on these real-world estimations.
Identify one specific estimation or large number fact from this chapter.
Explain how this fact challenged your prior assumptions about how 'big' these numbers really are.
How will you use the skill of estimation or number grouping in the future?