Word names for numbers

key notes:

Introduction to Number Words

  • Explain that number words are the written form of numbers (e.g., “one,” “two,” “three”).
  • Discuss why knowing number words is important (e.g., in writing checks, filling out forms, reading literature, etc.).

Basics of Number Words

Review the number words from 1 to 20: (one, two, three, four, five, six, seven, eight, nine, ten, eleven, twelve, thirteen, fourteen, fifteen, sixteen, seventeen, eighteen, nineteen, and twenty.)

Explain the patterns in number words from 21 to 99, emphasizing the use of hyphens (e.g., twenty-one, thirty-five).

  • 21-29: twenty-one, twenty-two, twenty-three, …, twenty-nine
  • 30-39: thirty-one, thirty-two, thirty-three, …, thirty-nine
  • 40-49: forty-one, forty-two, forty-three, …, forty-nine
  • 50-59: fifty-one, fifty-two, fifty-three, …, fifty-nine
  • 60-69: sixty-one, sixty-two, sixty-three, …, sixty-nine
  • 70-79: seventy-one, seventy-two, seventy-three, …, seventy-nine
  • 80-89: eighty-one, eighty-two, eighty-three, …, eighty-nine
  • 90-99: ninety-one, ninety-two, ninety-three, …, ninety-nine

Large Numbers

Remember how to write numbers between 1,000 and 999,999.

  1. First, write how many thousands.
  2. Next, write how many hundreds.
  3. Write the word “and” followed by the tens and the ones.

Indian System:

The Indian numbering system groups numbers in thousands, lakhs, and crores.

  • Thousands: 1,000 (one thousand)
  • Lakhs (Lacs): 100,000 (one lakh)
  • Crores: 10,000,000 (one crore)

Examples:

  • 1,23,45,678 is written as “one crore twenty-three lakhs forty-five thousand six hundred seventy-eight.”
  • 56,78,910 is written as “fifty-six lakhs seventy-eight thousand nine hundred ten.”

International System:

The International numbering system groups numbers in thousands, millions, billions, etc.

  • Thousands: 1,000 (one thousand)
  • Millions: 1,000,000 (one million)
  • Billions: 1,000,000,000 (one billion)

Examples:

  • 12,345,678 is written as “twelve million three hundred forty-five thousand six hundred seventy-eight.”
  • 567,891,000 is written as “five hundred sixty-seven million eight hundred ninety-one thousand.”

Summary:

  • Indian System: Uses lakhs and crores; the grouping is different with more emphasis on lakhs and crores.
  • International System: Uses millions and billions; the grouping is in thousands, millions, and billions.

Decimal Numbers

  • Explain how to read and write decimal numbers (e.g., 3.14 is “three point one four”).
  • Discuss the importance of place value in understanding decimal numbers.

Fractions and Percentages

  • Introduce number words for common fractions (e.g., 1/2 is “one half”).
  • Discuss how to read and write percentages (e.g., 25% is “twenty-five percent”).

Learn with an example

🔔 How do you write this number using words?

1,720

  • one thousand seven hundred and twenty
  • one thousand seven hundred and twenty-four
  • eight thousand seven hundred and twenty-four
  • eight thousand seven hundred and twenty

Remember how to write numbers between 1,000 and 999,999.

First, write how many thousands. Write one thousand.
Next, write how many hundreds. Write seven hundred.
Write the word “and” followed by the tens and the ones. Write: and twenty.

You write 1,720 as one thousand seven hundred and twenty.

🔔 How do you write this number using words?

1,513

  • one thousand eight hundred and thirteen
  • nine thousand eight hundred and thirteen
  • nine thousand five hundred and thirteen
  • one thousand five hundred and thirteen

🔔 How do you write this number using digits?

five thousand

  • 2,000
  • 5,000
  • 5,200
  • 2,200

Use a place value chart:

thousandshundredstensones
5000
5,000

Remember to use a comma between groups of numbers.

You write five thousand as 5,000.

Let’s practice!