The 5 times table lists the multiples of 5: 5 × 1 = 5, 5 × 2 = 10, … 5 × 12 = 60. "5x" usually refers to this multiplication table.
"5x" can mean 5 times a variable, but most people searching it want the 5 times table: 5 × 1 = 5, 5 × 2 = 10, … 5 × 12 = 60.
Learn the multiples of 5 from 5 × 1 = 5 up to 5 × 12 = 60. Count up by 5 each time, or drill yourself with the table above.