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2180

ARITHMETIC

Change to lowest terms: 11-   II,    W,    II,   i¥r

12. m, A'v, ^r,  ii

is. y&, ito,  ite,  T&V 14. rffr,   ft,    41,    It

15.  if, m, m, m

Addition:

21-  f + T7n + i + l

22.   12f + 20f + 152T%

23.   205f + 56| + 99f

24.   51 + 291 + 1^ + 49

25.   201f + 52i + 76^V

Multiplication .-

31.  HiXf

32.  AXfXH

33.  ^ X A X ii X 3^ X 4|

34.  &XSX*Xl5i

35.  |? X if X 3f X 10«

Change to other forms:

16.     69f,       ^f,     A|^a

17.     57$,      607$,       48|

18.   24A,        66f,       W

19.   362i       ^,     ^|A

20.     AJA,     i|-p

Subtraction:

26.   78| — 27-|f

27.   24f —5f

28.   18 i —12|

29.   281 —12T%

30.   72 — 15J

Division:

36.   171 ™ 21

37.   45| -r- 3^V

38.   A of 2| -r- f of 8|

39.   7i^-f

40.   13f -f- 25

TABLES OF MEASURE.

LENGTH OE DISTANCE.

12 inches (in. or ") =1 foot

(ft. or 0

3 feet = l yard (yd.) 5i/2 yd. or 161/2 ft. = l rod (rd.) 320 rods 5280

f— 1 statute mile (mi.)

4 inches = 1 hand 6 feet = 1 fathom

1.15 common 1__ 1 nautical mile

miles      J       1 geographical mile 3 knots = 1 league 1 league = 3 geographical miles

SUEFACE.

144 square inches (sq. in.) =1 square foot (sq. ft.)

9 square feet = 1 square yard (sq. yd.) lQi/4 square yards or 272^ square feet = l square rod (sq. rd.)

160 square rods = l acre (A.) 640 acres = 1 square mile (sq. mi.)

1 square mile = 1 section

36 square miles = 1 township

100 square feet = 1 square of flooring, shingles, slating, or roofing.

A surface has two dimensions, length and breadth. A rectangle is a plane surface bounded by four straight lines, and having all its angles right angles.