Placing both in the middle of the table you place the dime down first then place the quarter in the middle of the table on top of the dime. Placing the coins on the table is the last time you touch either coin. They must be placed in the "middle" of the table to start with.
Placing the coins side by side will not put "both" coins in the "middle " of the table.

Take the dime and place it on the floor under the table, and it will be under the quarter.

People confine themselves to self imposed limitations. The word "under" is NOT limited to the table top where the quarter is..... Put the dime on the floor "under" the quarter.

Step 1
Place a quarter and a dime in the middle of a table.

step 2
Can you take the dime and place it under the quarter
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The first step must be completed before going to step two.

dime on floor, quarter on table

Take a quarter and a dime on table take dime and give it to Obama, and tell him to keep the change. the dime will be under the table and Obama will be happier than a pig in Shiite...!

NO, No, no
ROFLMAO

Placing the dime on floor "under the table" puts the dime under the table not under the quarter.
LOL

Step 1
Place the dime in the center of the table. Place the quarter 1/2 inch away on right side tails up. If right handed, reverse if left handed.

step 2
Take a ball peen hammer and raise the hammer to an extended position with the peen of the hammer facing the table. With a downward force that would reach 18 ft pounds when striking the table 1 inch on the right side of the quarter hit the table.

The shock wave will flip the quarter onto the dime with one flip of the quarter.

Works every time.

Simply use the Law of Attraction to make the quarter levitate over the dime.
If that doesn't work, try Daily Affirmations.
I recommend this one:
"I'm good enough, I'm smart enough, and doggone it, people like me!!!

Place dime in center of table.place quarter near dime.
Hold vacuum hose intake over quarter close enough to levitate the quarter. Guide the levitated quarter until over top of dime reduce vacuum intake pressure until quarter rests on dime.

Place dime on the floor under the table is the answer.