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17-18      ARMY AIR FORCES

(1) Example: Multiply (+3.04) by (17.8).
Solution: Since the signs are the same, the product is 
+54.112 Answer.

(2) Example: (+.00395)×(-345.9)=?
Solution: Since the signs are unlike, the product is negative, or
-1.366305 Answer.

b. Exercises.—Find the product in each of the following exercises.
(1) (-1.6)(.9)
(2) (-14.4)(-12)              172.8 Answer.
(3) (12.5)(1.25)
(4) (-9)(-8)(-6)               -432 Answer.
(5) (-.17)(6)(-5)
(6) (2)(3.14)(9)              56.52 Answer.
(7) (-.4)(-.4)(-.4)
(8) (-1/3)(9/20)(5/6)          -1/8 Answer.
(9) (22/7)(1.4)(1.4)
(10) (-1 2/3)(9/10)(-8/15)      4/5 Answer.

c. In division the quotient is positive if the divisor and dividend have the same sign; if the divisor and dividend have opposite signs, the quotient is negative.
Example: Divide (-15.625) by (12.5)
Solution: Since the dividend and divisor have opposite signs, the quotient is negative.

-15.625/12.5=-1.25 Answer.
             
d. Exercises.—Find the quotient in each of the following exercises:
(1) (-14.4)÷(0.9)
(2) (-4.32)÷(-4.8)               0.9 Answer.
(3) (39,483.)÷(-12.3)
(4) (1,440.)÷(0.32)            4,500 Answer.
(5) (1.679)÷(23)
(6) (-23.04)÷(4.8)              -4.8 Answer.
(7)  1,728/-144
(8) 390.59/-28.1               -13.9 Answer.          
(9)   -72.9/-0.81  
(10) 0.6118/87.4               0.007 Answer.

18. Square root.—The process of extracting square root finds many uses in solving problems. Following are the rules:

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