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This is more of an algorithim, but here is how you can do any number times a one digit number quickly.
167859*7
1*7
6*7
7*7
8*7
5*7
9*7

\/
7
42
49
56
35
63
'''To put the numbers together just put them next to each other e.g 12*3 => 1*3 and 2*3 => 3 and 6 => 36. If the result has a 2 digit number then add the tens place from the 2 digit number to the next number left or above's ones place.'''
Credit to Abhishek V. R. for this method of doing mental multiplication.
Edit: I may not have written the part about putting the numbers together right. Please google "ofpad mental multiplication left to right" for the correct method.
Last edited by pi_cubed (20200629 06:13:15)
e to the i pi plus 1 is zero Leonhard Euler  a squared plus b squared equals c squared Pythagoras  Energy equals mass times the speed of light squared Albert Einstein  i² = 1  x^2+1=0 x^2=1 x=i
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