500
Number your fingers 6 to 10 starting with you thumbs working your way to your pinkies.
Start with left hand. stick out the finger which represents 6 (the thumb)
With your left hand group all the fingers it takes to get to 8 (thumb and two fingers)
Add all the fingers grouped to get the numbers 6 x 8. This would be 4. This is the first number of you answer
Next multiple the the fingers not grouped on the left hand side with the fingers with the right hand side. which is 4 x 2 = 8
6 x 8 = 48
How do you multiple 6, 7's, 8's, and 9's with your hands.
Use 6 x 8 as an example