Whole Numbers Counting and Writing

Welcome to class!

In today’s class, we will be learning the whole numbers counting and writing. Enjoy the class!

Whole Numbers Counting and Writing

In your previous classes that is primary 5 and 6 Book, you all have learnt how to count in thousands and millions. Such that, when reading numbers with more than seven digits, breaking the number into groups of threes (3s) starting from the unit digits, we then read from the leftmost group.

Counting and writing

Counting numbers in millions:

Example 1: Read the following numbers aloud.

10 000 000 = Ten million

25 000 000 = Twenty-five million

40 000 000 = Forty million

50 000 000 = Fifty million

70 000 000 = Seventy million

75 000 000 = Seventy-five million

90 000 000 = Ninety million

Example 2: Read the following aloud.

100 000 000 = One hundred million

250 000 000 = Two hundred and fifty million

400 000 000 = Four hundred million

500 000 000 = Five hundred million

700 000 000 = Seven hundred million

750000 000 = Seven hundred and fifty million

900 000 000 = Nine hundred million

Example 3: Read and write the following numbers in words.

(a) 2538476

(b) 45 832 647

(d) 85000 000

(a) Two million, five hundred and thirty-eight thousand, four hundred and seventy-six.

(b) Forty-five million, eight hundred and thirty-two thousand, six hundred and forty-seven

(d) Eight hundred and fifty million.

Note: We can also write in numerals, numbers that are written in words.

Example 4: Write the following in numerals.

(a) Six million, one hundred and twenty-eight thousand and thirty-five.

(b) Seventy-two million, four hundred and thirteen thousand, eight hundred and twenty.

(a) 6 128 035

(b) 72413 820

Counting up to 1 billion:

Note: This contained up to nine-digit numbers.

Read the following aloud:

900 000 000 = Nine hundred million

910 000 000 = Nine hundred and ten million

920 000 000 = Nine hundred and twenty million

930 000 000 = Nine hundred and thirty million

940 000 000 = Nine hundred and forty million

950 000 000 = Nine hundred and fifty million

960 000 000 = Nine hundred and sixty million

970 000 000 = Nine hundred and seventy million

980 000 000 = Nine hundred and eighty million

990 000 000 = Nine hundred and ninety million

1 000 000 000 = One billion

Counting numbers in billions

Example 5: Read the following aloud.

5 000 000 000 = five billion

10 000 000 000 = ten billion

20 000 000 000 = twenty billion

50 000 000 000 = fifty billion

100 000 000 000 = one hundred billion

200 000 000 000 = two hundred billion

Examples 6:

1 125 000 000 reads one billion, one hundred and twenty-five million.
21 752 052 363 reads twenty-one billion, seven hundred and fifty-two million, fifty-two thousand, three hundred and sixty-three.
1 000 000 032 reads one billion and thirty-two
3 103 000 190 reads three billion, one hundred and three million, one hundred and ninety

Counting numbers up to 1 trillion

Example 7: Read aloud the following numbers.

1 000 000 000 = one billion

10 000 000 000 = ten billion

20 000 000 000 = twenty billion

30 000 000 000 = thirty billion

60 000 000 000 = sixty billion

80 000 000 000 = eighty billion

100 000 000 000 = one hundred billion

300 000 000 000 = three hundred billion

600 000 000 000 = six hundred billion

900 000 000 000 = nine hundred billion

1 000 000 000 000 = one trillion

Counting numbers in trillions

Examples 8:

3 000 000 000 000 = three trillion

5 000 000 000 000 = five trillion

10 000 000 000 000 = ten trillion

20 000 000 000 000 = twenty trillion

50 000 000 000 000 = fifty trillion

90 000 000 000 000 = ninety trillion

Examples 9: Read aloud the following numbers

100 000 000 000 000 = one hundred trillion

200 000 000 000 000 = two hundred trillion

300 000 000 000 000 = three hundred trillion

500 000 000 000 000 = five hundred trillion

700 000 000 000 000 = seven hundred trillion

900 000 000 000 000 = nine hundred trillion.

Examples 10: Read and write the following in words.

800 000 000 000
15 608 000 000 000
240 509 000 000 000
765 423 154 628 450
Eight hundred billion
Fifteen trillion, six hundred and eight billion
Two hundred and forty trillion, five hundred and nine billion
Seven hundred and sixty-five trillion, four hundred and twenty-three billion, one hundred and fifty-four million, six hundred and twenty-eight thousand, four hundred and fifty.

In our next class, we will be talking about the Lowest Common Multiple (LCM) and the Highest Common Factor (HCF) of Whole Numbers. We hope you enjoyed the class.

Should you have any further question, feel free to ask in the comment section below and trust us to respond as soon as possible.