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4d. under its proper column, and add the 2s. to the column of shillings, the sum of which is 71s. equal to £3. 11s.; having written the 11s., we add the £3 to its column, and find the sum of which to be £23. From the above process, we induce the following

RULE.

Write all the given numbers of the same denomination under each other; then add the numbers of the lowest denomination together, and divide their sum by so many as make one of the next higher denomination; set the remainder under its column, and add the quotient to the next column; which add together and divide as before; thus proceed to the last denomination, under which place its whole sum.

2. What is the sum of £6. 19s. 11d. 3qr., £9. 6s. 3d. 3qr., £13. 18s. 3d. 1qr., and £67. Os. 8d. 1qr.? Ans. £97. 5s. 3d. Oqr.

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Section 10.

COMPOUND SUBTRACTION.

COMPOUND SUBTRACTION teaches to find the difference between two numbers of different denominations.

1. A bill on the bank of England for £713. 17s. 11d. 3qr. was sold for £765. 16s. 10d. 1qr.; what was the sum gained? Ans. £51. 18s. 10d. 2qr.

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add to the 1qr.=5qr. Take 3qr. from 5qr., and 2qr. remain, which we write under the column of farthings; and, as in simple numbers, we carry one to the next lower number before subtracting. And 1d. carried to 11d. is 12d. ; but, as we cannot take 12d. from 10d., we must again borrow 1s. from the 16s. = 12d. and add it to the 10d. = 22d. Then take 12d. from 22d. = 10d., which we set down and carry one, as before, and so on till the whole be subtracted. Hence the following

RULE.

Write those numbers under each other, which are of the same denomination, the less compound number under the greater. Begin with the lowest denomination, and subtract each lower number from the one above it, and write the difference underneath. If any lower number be larger than the upper, suppose as many to be added to the upper number as would make one of the next higher denomination, then subtract the lower figure, remembering to carry one to the next lower number before subtracting it; and proceed thus, till all the numbers are subtracted.

2. From £87. 11s. 9d. 3qr. take £41. 5s. 6d. 1qr. Ans. £46.6s. 3d. 2qr.

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