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LETTER XII. 
IS U PP O S E you have not forgotten your 
Multiplication-table. If you have it not 
quite perfect, fpend half an hour in giving 
it a firm eftablifliment in your memory; 
for the leaft miftake or hefitation in the 
mechanical part of multiplication, will leave 
a bad impreflion on the mind of your Tutor. 
The operation of multiplying one row of 
figures by another, is eafily learnt, but not 
generally underftood. I will endeavour to 
explain it by a (hort example. It is necef- 
fary however, previoufly to obferve, that 
Multiplication and Addition are in reality 
the fame: thus, 
Add . \ 3 
(3 
Sum o 
Multiply 3 
b y - 2. 
Produft 9 
The 
