$$ {4\over 7}×{2{4\over 5}} ÷{2\over 5}=?$$

 If $${1\over 4.263}=0.2346$$, find the value of $${1\over0.0004263}.$$

Direction: What approximate value will come in place of the question mark (?) in the following question? (You are not expected to calculate the exact value)

468.02 + 79.91 ÷ 5.01 = ?²

(0.85 % of 405 ) + (2.25 % of 550 )=?

If p = 99, then value of p(p² + 3p + 3) is

Direction: What approximate value will come in place of the question mark (?) in the following question? (You are not expected to calculate the exact value)

{(540.34)/(17.99)} ÷ {(29.99)/(449.89)} × {1/(89.78)} = ?

? – 2³ =(7² – 12 ) + ( 10² -17)

If $${8+2\sqrt{3} \over 3\sqrt{3}+5}=a\sqrt{3}-b$$, then the value of a+b is equal to: