GoobNet

GoobNet menu

GoobNet

BRINGING THE THRILL OF COOKIES TO YOUR FRONT DOOR

WEEKLY WHINE

But who’s multiplying: Peasant multiplication

The methods we have seen so far – long multiplication and lattice multiplication – both require knowledge of the 9×9 multiplication table. But that’s not the only way to do it. The ancient Egyptians, much like GoobNet, were fans of powers of two, and so they developed a multiplication method so based. Here is a variation on that method, often called peasant multiplication.

7829
3958
19116
9232
4464
2928
11856
 2262
NEW

All that is required is to halve one multiplicand, truncating any fractions, and double the other. Continue until a one ends up in the first column. Then sum all of the multiples of the second multiplicand that are paired with odd fractions of the first.

The fun part of this method is that the multiplication tables are optional. If they are unavailable, multiplying and dividing by two are easy enough. This method can also be done if paper isn’t available, but markers like Monopoly houses are.

As can be seen below, this is a fairly straightforward process that only requires heavy work when it comes time to sum the appropriate intermediate products. But when one multiplicand is fairly small, this is clearly a good approach that has little overhead.

9318861270
46591722540
23293445080
11646890160
58213780320
29127560640
14555121280
72110242560
36220485120
18440970240
9881940480
41763880960
23527761920
17055523840
 8025313860
NEW

PLEASE SEND ALL FIREWOOD TO <GOOBNET‍@‍GOOBNET.NET>

© 2018 GOOBNET ENTERPRISES, INC [WHICH DOESN’T ACTUALLY EXIST HOWEVER]

THIS FILE ACCURATE AS OF: THU 06 DEC 2018 – 06:34:56 UTC · GENERATED IN 0.007 SECONDS