6×8 is a simple operation of 6+6+6+6+6+6+6. When the quantity is small, it can be added directly, and if the quantity is large, it will be troublesome.

Therefore, our ancestors invented the multiplication formula and memorized it, so we can work out the answer at once.

The multiplication formula for 6×8 is: 6848, that is, 6× 8 = 48.