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Decimal Fraction
1.
Evalute:(2.39)2(1.61)22.391.61

Answer:Option 1

Explanation:

Solution:
GivenExpression=a2b2ab=(a+b)(ab)(ab)=(a+b)=(2.39+1.61)=4

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2.What decimal of an hour is a second ?

Answer:Option 1

Explanation:

Solution:
Requireddecimal=160×60=13600=.00027

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3.
Thevalueof(0.96)3(0.1)3(0.96)2+0.096+(0.1)2is:

Answer:Option 1

Explanation:

Solution:
Givenexpression=(0.96)3(0.1)3(0.96)2+(0.96×0.1)+(0.1)2=(a3b3a2+ab+b2)=(ab)=(0.960.1)=0.86

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4.If 2994 ÷ 14.5 = 172, then 29.94 ÷ 1.45 = ?

Answer:Option 1

Explanation:

Solution:
29.941.45=299.414.5=(299414.5×110)[Here,Substitute172intheplaceof299414.5]=17210=17.2

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5.When 0.232323..... is converted into a fraction, then the result is:

Answer:Option 1

Explanation:

Solution:
0.232323...=0.23¯=2399

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6.
.009?=.01

Answer:Option 1

Explanation:

Solution:
Let.009x=.01;Thenx=.009.01=.91=.9

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7.The expression (11.98 x 11.98 + 11.98 x x + 0.02 x 0.02) will be a perfect square for x equal to:

Answer:Option 1

Explanation:

Solution:
Given expression = (11.98)2 + (0.02)2 + 11.98 x x.
For the given expression to be a perfect square, we must have
11.98 x x = 2 x 11.98 x 0.02 or x = 0.04

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8.3889 + 12.952 - ? = 3854.002

Answer:Option 1

Explanation:

Solution:
Let 3889 + 12.952 - x = 3854.002.
Then x = (3889 + 12.952) - 3854.002
    = 3901.952 - 3854.002
    = 47.95.

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9.0.04 x 0.0162 is equal to:

Answer:Option 1

Explanation:

Solution:
4 x 162 = 648. Sum of decimal places = 6.
So, 0.04 x 0.0162 = 0.000648 = 6.48 x 10-4

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10.
4.2×4.21.9×1.92.3×6.1isequalto:

Answer:Option 1

Explanation:

Solution:
GivenExpression=(a2b2)(a+b)(ab)=(a2b2)(a2b2)=1

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