1- To square No component of nines only Quickly and without multiplying :
We write from the left a number of Nines one less than the number of Nines in the number and then write 8 and then write the number of zeros equal to the Nines, which prescribe the number and then write one
ex1 : 999 × 999 square of the number quickly without multiplying we write only 99 then 8 to become the number 998 and add two zeros become number 99 800 and finally add 1 and becomes the final output: 998 001
ex2 :to square ( 9999 × 9999) we write only 999 then 8 to become 99980001
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