81. Which of the following is a prime number ?
82. The number of prime numbers between 301 and 320 are :
83. 6 × 66 × 666 = ?
84. What is 394 times 113 ?
85. 12345679 × 72 is equal to :
86. (71 × 29 + 27 × 15 + 8 × 4) equals :
87. $$\frac{{{{\left( {489 + 375} \right)}^2} - {{\left( {489 - 375} \right)}^2}}}{{\left( {489 \times 375} \right)}} = ?$$
88. If all the numbers from 501 to 700 are written, what is the total number of times the digit 6 appears ?
89. The number (248 - 1) is exactly divisible by two numbers between 60 and 70. The numbers are :
90. When the square of any odd number, greater than 1, is divided by 8, it always leaves remainder :
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