Yes, there is; and not only does it make finding the other two notes of your chord easier, its going to make the chord you play sound much wider and fuller. Here’s what you do: first find a note that matches the chord indicated, and put your left thumb on it, (the “bass” note). Now, find the exact same note, one octave higher, and put the ring finger of your right hand on it, (the “high note”).
Call the note you hit with your left thumb, the “1”. If you find the third and the five, then you can play the one as a bass note with your left hand, the three and five with the thumb and first finger of your right hand, and you will have the “tonal note” at both the top and bottom of your chord! I’ll illustrate using a “G” chord.
Find a G note. 1=G. Count up two whole steps to a “B” note, put your right thumb on that, 3=B, up one whole step to a C#, and up one half step to a “D”, 5=D.
So, if you play only one note with your left thumb, and the third, the fifth, and the “tonal”, with your right hand, then you really only need to make sure your left thumb and right ring finger are on the notes indicated as the next chord, and your finger positions will remain exactly the same, no matter which chord comes next!
No matter what the next chord is, if you move your hand position to the tonal of that chord on both the top and bottom, you can leave your finger positions the same, as the chord will be a 1-3-5, (or 1-b3-5, if minor).
And, to play a song right now, from a chart of music, that really is all you absolutely need to know. Left to right: 1-3-5-1 (one octave higher). Next chord; same intervals. Repeat as needed.
Beyond the Basics
Of course, there is rather more to music theory than just major and minor triads. And, if requested, I’ll be more than happy to write a follow-up article explaining sevenths, diminished chords, key structure, compound chords…
But for now, you have a new skill. Have a great time, while amazing your friends!