How many shuffles do you need to randomize 100 cards?

So if you're playing a 60-card Modern deck, riffle at least eight times (though you could probably get away with 7, still). If you're playing a 100-card EDH deck, riffle at least ten times. If you're playing a 500,000-card monster deck, riffle at least 28 times.

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How many mash shuffles are there?

If you're playing a 60 card format 7 riffle/mash shuffles are sufficient. If you're playing commander which uses 100-card decks, you'll need to riffle shuffle 9 times to be randomized enough. Shuffling more does make the deck more random, but 7 (or 9) iterations is enough in practice. Thereof, how do you shuffle tarot cards for the first time? Let's get back to how to shuffle tarot cards, which is actually really simple: Open your tarot card deck, and cleanse it if it's brand new. Hold the cards and ruminate on a question you'd love guidance in answering. Then focus on that question and shuffle the cards in whatever way you see fit.

And another question, how do you shuffle 3 decks of cards?

Grab about one deck's worth of cards from stack 1 and an equal amount from stack 3. Shuffle these two stacks together and place them on the cut card. Repeat with stacks 2 and 4, placing the newly-shuffled cards on top of the previously-shuffled cards resting on the cut card. Then, how do you shuffle cards professionally?

How do I learn to shuffle?