Whole Numbers

Hello math lovers! I am so excited to write a blog especially it is about my favourite subject which is MATHEMATICS. Let me begin with the history of mathematics before lessons are given here. 

We know that there are different types of number system from one culture to another. Take for examples, Arabic numbers, Roman numbers, Chinese numbers and Babylonian numbers.

As we can see, there are many symbols to represent numbers in Egyptian number systems.

This inscription, found in Rome, reads M D LXXXIII or 1583.

We are using Arabic numerals universally such as 0, 1, 2, 3….9 which students have learnt since kindergarten. As for the standard of students in year 5, numbers up to 1,000,000 will be taught.

 Name and write numbers up to 1,000,000

1) Every digit in a whole number has its own value and place value.

Example 1: Write the number 734 043 in words.

Solution:  Seven hundred thirty-four thousand and forty-three

2) Whole numbers can be written as decimals or fractions of a million or vice versa.

Example 2 : a) Write 4 900 000 as a decimal of a million.

                     b) Write 250 000 as a fraction of a million.

Solution:   a) 4900 000 =   4 900 000  
                                            1 000 000

                                       = 4.9 million

                    b) 250 000  =  250 000  
                                           1 000 000

                                       =   25  million
                                         100

                                      =  1   million
                                         4
Example 3 : Write the following as whole numbers.
                     a) 0.062 million                  b) 2  1 
                                                                        4

Solution: a) 0.0062 million = 0.0062 x 1 000 000
                                        =  62 000

              b)  2  1  million =  2  1   x 1 000 000 
                       4                       4

                                        = 2.25 x 1 000 000

                                       = 2 250 000

3) A whole number can be rounded off to a required nearest place value.

Example 4 : Round off 256 132 to the nearest ten thousand.

Solution: 256 132 become 260 000

                   (6 is more than 5)