Multiplication is performed as if there were no comma ; but in the sum total, as many figures must be cut off at the right hand of the comma, as are cut off in both the multiplier and sum multiplied. For example:
4,37 183,2
2,3 0,24
1311 7328
874 3664
10,061 43,968
Multiply 37,04 by 4,8
3,96 by 0,84
18,5 by 5,18
468,007 by 8,14
In Division, add ciphers at the right of whichever of the two numbers has the least number of decimal figures, that the dividend or sum to be divided, and the divisor or sum to divide by, may have an equal number of them ; then pay no regard to the comma, and divide as in ordinary arithmetick.
When you have found the wholes of the quotient,u place a comma after them, and then find the decimals by putting a cypher at the right of the remainder, and dividing anew, you will then have the first figure after the comma in the quotient. Add another cipher to the remainder, and you will have another decimal figure, and so on.
