COUNTING OF NUMBERS

Back to: Mathematics Primary 5

HELLO, WELCOME TO A NEW CLASS

 

Mathematics involves solving problems that involve numbers. We will work with whole numbers, which are any of the numbers 0, 1, 2, 3, and so on.  A digit is one of the symbols 0, 1, 2, 3, 4, 5, 6, 7, 8, or 9. All numbers are made up of one or more digits. Numbers such as 2 have one digit, whereas numbers such as 89 have two digits. To understand what a number really means, you need to understand what the digits represent in a given number.

                

                   

                   

OR WE SAY

2          =         2000   —-                  Thousand     (1000)

3          =          300     —                    Hundred       (100)

4          =            40     —                    Tens                (10)

5                         5       —-                   units

  2,34

WRITE IN WORD    

1. 3,469 =Three thousand, four hundred and sixty nine
2. 4, 196 =  four thousand, one hundred and ninety six
3. 26, 717 = twenty six thousand, seven hundred and seventeen
4. 214,616=two hundred and fourteen thousand, six hundred and sixteen

WRITE IN FIGURE

 

Interval of  2

          32        34      36        38      40

42        44       46      48       50

52       54        56       58       60

Interval of 5

           65     70      75      80       85

90     95      100    105    110

115   120    125   130     135   140

          Interval of 10

150   160 170 180 190   200

210 220 230 240 250 260             

           Interval of 20

           280  300  320  340  360  380  400  420  440 460  480  500

          Interval of 50

550 600 650 700 750 800 850 900 950 1000

WRITING UP TO MILLIONS

Standard form is the usual way to write a number using digits.

Word form is the way you read or say a number.

Expanded form shows the value of each digit.

 

EXAMPLE 3:

Write 268,731 in word form and expanded form.

Solution

 

Word form: Two hundred and Sixty-eight thousand, seven hundred and thirty-one

 

Expanded form: 200,000 + 60,000 + 8,000 + 700 + 30 + 1

 

EXAMPLE 4:

Write twenty-two million, eight hundred and five thousand, fifty-five in standard and expanded form.

Step1: Write it down in period by period

Twenty-two million =22,000,000

Eight hundred five thousand = 805,000

Fifty-five = 55

Step2: Add up

22,000,000

805,000

+          55

22,805,055

Standard form: 22,805,055

Expanded form: 20,000,000 + 2,000,000 + 800,000 + 5,000 + 50 + 5

Quiz

Write these numbers in words:

• 4567
• 34289
• 457329
• 1657389
• 3246781

 

Write these amounts in digits:

• Two thousand and thirty four
• Twelve thousand, two hundred and eight
• One hundred and twelve thousand, six hundred and forty five.
• Seven million thirty four thousand and seven
• six million, seven hundred and twenty two thousand, four hundred and three.

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