Thus by adding 2 to aN we can subtract N from aN+2, obtaining 2000-0000, which is =2.
Similarly we cannot subtract 8 from 15, if 15 means 1 ten + 5 ones; we must either write 15-815-8=(10+5)-8= (I o - 8)+5 = 2+5 = 7, or else resolve the 15 into an inexpressible number of ones, and then subtract 8 of them, leaving 7.
To subtract, we may proceed in either of two ways.
To compare them, or to add or subtract them, we must express them in terms of the same unit.
According to this law, Io+3+6-7= Io +3-7+6 = 3+6-7+10 = &c. But, if we write the expression as 3-7+6+10, this means that we must first subtract 7 from 3.
The process is the same as that of finding the sum or differ I ence of 3 sixpences and 5 fourpences; we cannot subtract 3 sixpenny-bits from 5 fourpenny-bits, but we can express each as an equivalent number of Ones.
To add or subtract decimals, we must reduce them to the same denomination, i.e.
To add or subtract fractional numbers, we must reduce them to a common denominator; and similarly, to multiply or divide surds, we must express them as power-numbers with the same index.
To subtract £3, 5s.
Thus to subtract 5s.
Into 12D., So That We Subtract £3, 5S.
On The Counting System It Will Be Found That, In Determining The Number Of Shillings In The Remainder, We Subtract 5S.
In actual practice, of course, we subtract large multiples at a time.
We first construct the multiple-table C, and then subtract successively zoo times, 30 times and I times; these numbers being the partial quotients.
In incomplete partition the quotient is 3, and the remainders 11 and 17 are in effect disregarded; if, after finding the quotient 3, we want to know what remainder would be produced by'a direct division, the simplest method is to multiply 3 by 2 4 0 and subtract the result from 935.
To find the square root of N, we first find some number a whose square is less than N, and subtract a 2 from N.
She can add and subtract with great rapidity up to the sum of one hundred; and she knows the multiplication tables as far as the FIVES.
I would not subtract anything from the praise that is due to philanthropy, but merely demand justice for all who by their lives and works are a blessing to mankind.