Beauty of U.D. NUMBERS!

There is a word called Up Side Down which is U.D. in shortened form. The numbers which change in another when we reverse them is called U.D. numbers. For example, when we reverse 6 we will get 9 and when we reverse 9 we will get 6! So, 6 and 9 are both U.D. numbers.

The original U.D. number is four. 1,6,8 and 9. Here we will talk about some fun fact of U.D. numbers.

# The first ten natural numbers can be formed using the basic four U.D. numbers!

                              
                                è0 = 9-8-1
                                è1 = 9-8

                                è2 = 8-6

                                è3 = 9-6

                                è4 = 9-6+1

                                è5 = 6-1

#The basic four U.D. numbers are within first ten natural numbers. The average of four U.D. is equal to 6 (6 is the number of non-U.D. within first ten natural numbers)

                                è(1 + 6 + 8 + 9) / 4 = 6

#If we create four number by placing two U.D. number side by side and arrange them in cyclic form, Then their average is 66!

                               

                                è(16 + 68 + 89 + 91) / 4 = 66

# If we create four number by placing three U.D. number side by side and arrange them in cyclic form, Then their average is 666!

                               

                                è(168 + 689 + 891 + 916) / 4 = 666

#Some U.D numbers can be formed using other U.D. numbers!

                                è16 = 88 – (8x9)

                                è18 = 66 – (6x8)

                                è89 = 98 – 9
                                è161 = 169 – 8  
                                è868 = 869 – 1