81. $$\frac{256 × 256 - 144 × 144}{112}$$ is equal to :
82. In doing a question of division with zero remainder. a candidate took 12 divisor instead of 21. The quotient obtained by him was 35. The correct quotient is :
83. The number of prime numbers between 0 and 50 is :
84. What number multiplied by 48 will give the same product as 173 multiplied by 240 ?
85. What is the minimum number of four digits formed by using the digits 2, 4, 0, 7 ?
86. When 2256 is divided by 17, the remainder would be :
87. 5566 - 7788 + 9988 = ? + 4444
88. The sum of the digits of a 3-digit number is subtracted from the number. The resulting number is always :
89. The number of zeros at the end of the product 5 × 10 × 15 × 20 × 25 × 30 × 35 × 40 × 45 × 50 is :
90. 8888 + 848 + 88 - ? = 7337 + 737
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