🔭 JSS 1🔢 Mathematics📅 First Term

Counting Whole Numbers in Millions, Billions and Trillions

Hello class! Today we will learn how to read and write very big whole numbers. We will see how millions, billions and trillions are written with zeros. It is like counting the money in naira and kobo when the numbers become huge!

💡 What is a Million?

A million is 1 followed by six zeros: 1,000,000. Think of a big market in Lagos where each stall sells 1,000 items. Ten hundred stalls would give you a million items.

🧠 What is a Billion?

A billion is 1 followed by nine zeros: 1,000,000,000. It is a thousand millions. Imagine the population of Nigeria (about 200 million) multiplied by five – you get close to a billion.

🔍 What is a Trillion?

A trillion is 1 followed by twelve zeros: 1,000,000,000,000. It is a thousand billions. If each Nigerian saved 5,000 naira every day for a year, the total would be close to a trillion naira.

📌 How to Write Them

Write the number in groups of three digits from the right, using commas. Example: 3,456,789,012 is three billion four hundred fifty‑six million seven hundred eighty‑nine thousand twelve.

✏️ Worked examples

Example 1: Write 7,200,000 in words.
Solution: Seven million two hundred thousand.
Example 2: What is 5,000,000,000 written with commas?
Solution: 5,000,000,000 = 5,000,000,000 (five billion).
Example 3: Add 1,250,000 + 2,750,000.
Solution: 1,250,000 + 2,750,000 = 4,000,000 which is four million.
Example 4: If a bank has 3,000,000,000 naira and receives another 2,000,000,000 naira, how much does it have now?
Solution: 3,000,000,000 + 2,000,000,000 = 5,000,000,000 naira = five billion naira.

⭐ Remember

  • A million = 1,000,000 (six zeros).
  • A billion = 1,000,000,000 (nine zeros).
  • A trillion = 1,000,000,000,000 (twelve zeros).
  • Group digits in threes from the right and use commas.
  • Read the groups as thousand, million, billion, trillion.
  • Practice writing numbers both in digits and words.

🙌 Try this

Write the number 9,876,543,210 in words and then add 1,000,000,000 to it. What is the new number?

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10 questions · pass mark 50%

✨ Lesson written by AI from the Nigerian curriculum. Please tell us if you spot a mistake.