1.  (.00625 of 23/5), when expressed as a vulgar fraction, equals?


23/80
23/800
2/8000
125/3


Answer

 Option

(.00625 of 23/5) = (625/100000*23/5) = 23/800

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2.  (0.05/0.25 + 0.25/0.05)^3 =?


139.4
140
140.6
143.9


Answer

 Option

(0.05/0.25 + 0.25/0.05)^3 = (5/25 + 25/5)^3 = (1/5+5) = (26/5)^3 = (5.2)^3 = 140.608

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3.  The arrangement of rational numbers -7/10, 5/-8, 2/-3 in ascending order is?


2/-3,5/-8,-7/10
5/-8,-7/10,2/-3
-7/10,5/-8,2/-3
-7/10,2/-3,5/-8


Answer

 Option

-7/10 =-0.7, 5/-8 = - 5/8 = -0.625, 2/-3 = - 2/3 = -0.66. Since -0.7 < -0.66 < -0.625 So, -7/10 < 2/-3 < 5/-8.

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4.  0.000006723 when expressed in scientific notation, is:


6723*10^-5
67.23*10^-7
6.723*10^-6
None of these


Answer

 Option

0.000006723 = 0.000006723*10^6/10^6 = 6.723/10^6 = 6.723*10^-6

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5.  The value of 0.0396/2.51 correct to 2 significant figures is?


0.015
0.0157
0.016
0.017


Answer

 Option

0.0396/2.51 = 3.69/251 = (396/251*100) = 1.577/100 = 0.01577 = 0.016

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