The Incredible Hand Calculator

10 x 9 = 90

9
fingers on the left

1 x 9 2 x 9 3 x 9 5 x 9 4 x 9 left hand9 x 96 x 98 x 97 x 9right hand, first digit on the right folded down

0
fingers on the right

Watch the demo again

 

Try another one

Try it without helps

MoreThanMaths.com