Algorithms; Arithmetic -- Early works to 1900; Mathematics -- History
[Sidenote: How to multiply two digits. Subtract the greater from ten;
take the less so many times from ten times itself. Example.]
¶ Her{e} he teches a rewle, how þ{o}u schalt fynde þe nounb{r}e þat
comes by þe m{u}ltiplicacioɳ of a digit be anoþ{er}. loke how mony
[vny]tes ben. bytwene þe mor{e} digit and 10. And reken ten for on
vnite. And so oft do away þe lasse nounbre out of his owne decuple, þat
is to say, fro þat nounb{r}e þat is ten tymes so mych is þe nounb{re}
þ{a}t comes of þe m{u}ltiplicacioɳ. As yf þ{o}u wol m{u}ltiply 2 be 4.
loke how mony vnitees ben by-twene þe quych is þe mor{e} nounb{re},
& be-twene ten. C{er}ten þ{ere} wel be vj vnitees by-twene 4 & ten.
yf þ{o}u reken þ{ere} w{i}t{h} þe ten þe vnite, as þou may se. so mony
tymes take 2. out of his decuple, þe quych is 20. for 20 is þe decuple
of 2, 10 is þe decuple of 1, 30 is þe decuple of 3, 40 is þe decuple of
4, And þe oþ{er} digetes til þ{o}u come to ten; & whan þ{o}u hast y-take
so mony tymes 2 out of twenty, þe quych is sex tymes, þ{o}u schal leue 8
as þ{o}u wost wel, for 6 times 2 is twelue. take [1]2 out of twenty,
& þ{ere} schal leue 8. bot yf bothe þe digett{es} [*leaf 155a] ben
y-lyech mych as her{e}. 222 or too tymes twenty, þen it is no fors quych
of hem tweyn þ{o}u take out of here decuple. als mony tymes as þ{a}t is
fro 10. but neu{er}-þe-lesse, yf þ{o}u haue hast to worch, þ{o}u schalt
haue her{e} a tabul of figures, wher{e}-by þ{o}u schalt se a-nonɳ ryght
what is þe nounbre þ{a}t comes of þe multiplicacioɳ of 2 digittes. þus
þ{o}u schalt worch in þis fig{ur}e.
[Sidenote: Better use this table, though. How to use it. The way to
use the Multiplication table.]
1|
-----
2| 4|
--------
3| 6| 9|
-----------
4| 8|12|16|
--------------
5|10|15|20|25|
-----------------
6|12|18|24|30|36|
--------------------
7|14|21|28|35|42|49|
-----------------------
8|16|24|32|40|48|56|64|
--------------------------
9|18|27|36|45|54|63|72|81|
----------------------------
1| 2| 3| 4| 5| 6| 7| 8| 9|
----------------------------
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