The Merchants Mechanics Commercial Arithmetic Or Instantaneous Method of Co
The Merchants Mechanics Commercial Arithmetic Or Instantaneous Method of Co
John Wade
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Dividing by 4, we have the factors 4 and 112896. This last factor ends in 6; therefore, by tlie table, we see it must divide by 16 or 36. Dividing by 36 we have the factors 36 and 3136. This last factor, ending in 6, we divide by 16, and have the factors 16 and 196. Dividing this last factor by 4 we liave 4 and 49. Take our divisors and last factor, 49, and we have for the ori- crinal number, 4X36X16X^X^9, the roots of which are 2X6X4X2X^=672. COMMERCIAL ARITHMETIC. 73 6 Extract the square root... of 1225. Ans. 35. Divide by the square number 25 and we have the two factors 25 and 49 as equivalent to the given number. Roots of these factors, 5X^=35. Or, as tho number ends in 25, we may multiply by 4 and we have 4900, the root of which is 70 — which, divi- ded by 2, the square root of 4, gives 35. Problem. — The top of a castle is 45 yards high and the castle is surrounded by a ditch 60 jards wide. Required, the length of a rope that will reach from tho outside of the ditch to the top of the castle.
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