4. Multiply 46 feet 11 inches 8", by 12 feet 7′′

5. Multiply 87 feet 9 inches, by 11 feet 10 inches.

6. Multiply 687 feet 7 inches, by 24 feet 10 inches.

To find the superficial content multiply the length by the breadth.

7. Find the content of a board 8 feet 4 inches long and 3 feet 4 inches broad.

8. Find the area of a table 10 feet 9 inches long, and 6 feet 4 inches broad.

9. What is the price of a marble slab, the length of which is 6 feet 4 inches, the breadth 3 feet 2 inches, at 7s. per foot?

10. Required the area of a square, the side of it being 23 feet 9 inches?

11. A grave-stone was charged at 5s. 2d. per foot; what was the price of it, the length of it being 7 feet 2 inches, the breadth 3 feet 6 inches?

12. How much will it cost to pave a court-yard at 7s. 8d. per foot, the length of it being 26 feet 9 inches, the breadth 12 feet 4 inches?

To find the solid content multiply the length, breadth, and thickness together.

13. What is the solid content of a block of marble 9 feet 2 inches long, 5 feet 8 inches broad, and 2 feet 3 inches thick?

14. Required the solid content of a box 6 feet long, 4 feet broad, and 34 feet deep?

15. A log of mahogany is 72 feet 74 inches long, 5 feet 61 inches broad, and 8 feet 6 inches thick. Required its solid content?

16. What would it cost having a cellar dug 18 feet 4 inches long, 12 feet 9 inches broad, and 9 feet 6 inches deep, at 6d. per solid yard?

17. Required the solid content of a log of beech, 27 feet 6 inches long, 2 feet 5 inches broad, and 1 foot 2 inches thick?

18. What is the value of a block of granite 8 feet 9 inches long, 3 feet 7 inches broad, and 4 feet 2 inches thick, at 7s. 6d. the solid foot?

MENTAL ARITHMETIC.

1. To find the value of 12 articles, the price of one being given.

RULE.-Reckon every penny in the price a shilling, and every farthing three pence.

Because the value of 12 articles at ld. each is 12d., or ls.

When there are a few over or under the dozen, calculate for a dozen, and add or subtract as may be required.

In this case find the answer for one dozen and take it ten times.

II.-To find the price of a gross, the price of one article being given.

RULE.-Reckon the pence in the price of one article as shillings, and the number of pence in these shillings will be the price of a gross in shillings.

Because taking the pence in the price as shillings is the same as multiplying by 12, and taking these shillings as pence again is the same as multiplying by 12 another time, and 12X12=144=1 gross.

III. To find the price per score, the price of one article

being given.

RULE.-Reckon a pound for every shilling in the price. Thus, there being 20 cwt. in a ton, the price of 1 ton at 7% 6d. per cwt. is 71. 10s.

IV. To find the value of 100 articles, the price of one

being given.

RULE.-For every farthing in the price take as many pence, and twice as many shillings. Thus, 100 pencils at 1d. each is 12s. 6d., 6 being the number of farthings.

In this case find the value of one score, and take it ten times for

the answer.

Because, by taking a penny for every farthing is the same as multiplying by 4, and taking 2 shillings for every farthing is the same as multiplying by 96, and 96+4=100.

V.-To find the price of one article, the rate per dozen being

given.

RULE.-Reckon a penny for every shilling in the rate per

VI. To find the price of one article, the price per gross

being given.

RULE.-Reckon the shillings of the price as pence, and divide them by 12.

Because taking the shillings as pence and dividing them by 12 is equal to dividing twice by 12, or 144.