__Millions__

Numbers written in millions must contain at least 7 digits. The seven digits must have two spaces separating them in “threes” from the right-hand side.

Examples:

- 12 000 000 stands for 12 million.
- 2 000 000 stands for 2 million.
- 1 000 000 stands for 1 million.
- 238 000 000 stands for 238 million.

__Billions__

Numbers written in billions must contain at least ten digits with three spaces separating them in “threes” from the right-hand side.

Examples:

- 12 000 000 000 stands for 12 billion.
- 4 000 000 000 stands for 4 billion.
- 7 456 201 456 stands for 7 billion, four hundred and fifty-six million, two hundred and one thousand, four hundred and fifty-six.
- 835 000 000 000 stands for 835 billion.

__Trillions__

Numbers written in trillions must contain at least thirteen digits with four spaces separating them in “threes” from the right-hand side.

Examples:

- 7 000 000 000 000 stands for 7 trillion.
- 25 000 000 000 000 stands for 25 trillion.
- 714 000 000 000 000 stands for 714 trillion.
- 1 000 million is called a trillion.

EX**AMPLE 1**

Write the following numbers in words:

- 51 807 508 051 754

Solution:

51 807 508 051 754 = 51 807 508 051 754 stands for fifty-one trillion, eight hundred and seven billion, five hundred and eight million, fifty-one thousand, seven hundred and fifty-four

- 6 006 006 006

Solution:

6006006006 = 6 006 006 006 stands for six billion, six million, six thousand and six

- 509 345
- 3 457 300 284
- 45 672 7 008

**EXAMPLE 2**

Write the following words in numerals

- Three hundred and fifty-four thousand, seven hundred and twenty
- Seven billion, two hundred and sixty-four million, one hundred and one thousand, two hundred and two

__Solution:__

Using expanded form,

- 300 000 + 50 000 + 4000 + 700 + 20 = 354 720
- 7 000 000 000 + 200 000 000 + 60 000 000 + 4 000 000 + 100 000 + 1000 + 200 + 2 = 7 264 101 202

**NOTE:** We no longer use commas between the groups of digits. Many countries use a comma as a decimal point; thus, to avoid confusion do not use commas for grouping the digits.

**STUDENTS ACTIVITY:**

**Question 1:** Write the following figures in words:

(i). 15284037 (ii). 789030861 (iii). 512278374415

(iv). 734015090700018 (v). 89780260044784 .

**Question 2:** Express the following in figures:

(i). Seven hundred and ninety-eight million, one hundred and thirty- two thousand five Hundred and forty- five.

(ii). Twenty-four billion, seventy-eight million, four hundred and thirty-six thousand, one Hundred and forty -eight.

(iii). Thirteen trillion, nine hundred and forty-one billion, three hundred and twenty-four million, forty-seven thousand, one hundred and ninety-eight.

(iv). Four hundred and seventeen trillion, two hundred and eighty billion, five hundred and six thousand, eight hundred and eighteen.

(v). Eighteen million, twenty-five thousand, six hundred and one.