古代エジプト掛け算法（２万年前）

Example 1

Q. 31 x 53 = 

1       53
2       106
4       212
8       424
16      848

16 + 8 + 4 + 2 + 1 = 31

53 + 106 + 212 + 424 + 848 = 1643

A. 1,643


Example 2

Q. 32 x 41 =

1       41
2       82
4       164
8       328
16      656
32      1312

32 = 32

1312 = 1312

A. 1,312


Example 3

Q. 33 x 27

1       27
2       54
4       108
8       216
16      432
32      864

32 + 1 = 33

864 + 27 = 891

A. 891


Example 4

Q. 12301 x 15046

1          15046
2          30092
4          60184
8         120368
16        240736
32        481472
64        962944
128      1925888
256      3851776
512      7703552
1024    15407104
2048    30814208
4096    61628416
8192   123256832

 8192
 4096
    8
    4
    1
-----
12301

123256832
 61628416
   120368
    60184
    15046
----------
185080846

A. 185,080,846