Effect 1
Imagine making a prediction by inversing a card inside a shuffled deck and then asking the spectator to add three 6-digit number together to get a new 6/7-digit number one of which is given by the mentalist/you, the other two 6-digit numbers are freely chosen by the spectator and then sum up the individual values of the new 6/7-digit number and create a random 2-digit number and then the spectator is asked to deal the card exactly by that amount and miraculously the prediction is revealed at that exact number!
Effect 2
Imagine asking the spectator to add three 6-digit number together to get a new 6/7-digit number one of which is given by the mentalist/you, the other two 6-digit numbers are freely chosen by the spectator and then sum up the individual values of the new 6/7-digit number and create a random 2-digit number and then the spectator is asked to look on to the 1st word of the page and now you can read their mind and tell them what word they are thinking of !

Powerful! Is it not?
You need only one method to do both the effect with very less effort and very little to none mental work.
AND IT'S EASY! IT's IMPROMPTU!
The method is very clean and clears all suspicion.
All you need is a calculator and a deck of card or a book or a pdf if you do not have book or deck of card with you!