Elementary arithmetic, with brief notices of its history... by Robert Potts.

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2. Acd together four million twenty thousand and seventy-nine,
twelve million two thousand and seven, and one million and five
thousand, and subtract 16538107 from the sum.
3. What is the difference between the aggregate of 1050, 325,
1769, 150801, and a million? Shew that the same difference is obtained by taking one of the numbers from a million, another from
the remainder, and so on for the rest of the numbers.
4. Subtract four billions thirty millions seventy-five thousand and
eleven from 8876521856201, and write the difference in words.
5. Find the remainder after subtracting the numbers 44444, 9999,
666, 77, 1, in succession from 1000000.
6. Find the difference between the sum of 31845, 814, 10345, and
the sum of 10014, 569, 1845.
7. Subtract the sum of 48002, 6100, and 5018462, from the difference of 1000000000 and 1234567890.
8. Subtract the difference between sixty billions and sixty thousands from the sum of fifty trillions and fifty millions.
V.
1. How may the accuracy of the process of subtraction be verified?
Give an example.
2. Subtract 819 from 918, explaining the process.
3. Shew that the difference of 254 and 125 is the same as the
difference when these numbers are each increased by 123.
4. What number subtracted from 670194 will leave 3825?
5. Half the sum of any two numbers is equal to the greater, and
half the difference is equal to the less number. Apply this to find the
two numbers whose sum is 521 and difference 175.
6. By how much does the sum of the numbers 27182818284 and
31415926535 exceed their difference?
VI.
1. Find the excess of 8765427 above 7634289 by means of the
arithmetic complement; and explain the principle.
2. Find the result by means of the arithmetic complement of the
numbers 578421, 854325, 104231, which are to be added, and of
325410, 684531, 213418, which are to be subtracted.
3. Find the difference of the sums of 256, 1875, 34210, and of
4008, 214, 56, by means of the arithmetic complement.
4. Find the difference of the aggregate of the numbers 1234567,
8543021, 5432147, and of 3245785, 5180072, by means of the arithmetic
complement.
5. Write five numbers of seven places of figures each under each
other, and beneath these write the arithmetic complements of four of
them. Shew that the sum of the nine lines of figures will consist of the
fifth line with 4 in the eighth place reckoned from the right-hand figure.