Take any two digit number ending in 9 and add the sum and products of the digit. For example if you take 29; 2+9= 11 and 2*9=18 and their sum if 11+18=29. Is it true for all two digit numbers ending in 9? If so explain why?
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Step-by-step explanation:
Let The dugit at 10's ploace=x and at unit ploace=9
Thus sum of digits=x+9
produt=9x
adding we get
9x+x+9
=10x+9
In your example : 29 so x=2
Thus sum=10*2+9=29
So it is not correct all two digit numbers ending in 9
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