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Science & Math for K6 - K12 Students

Prime Numbers
Exercise
 1. Which of the following is true? i. 2 is an even prime ii. 5, 7 are twin primes iii. 2, 3 are co–primes a)  i, ii b) ii, iii c)  i, iii d) i, ii, iii

 2. How many 2 digit numbers are there below 100? a) 89 b)  91 c)  90 d)  92

 3. How many multiples of 3 are there below 100? a)  32 b) 31 c)  33 d) 34

 4. If sum of first twelve odd numbers are added to sum of first twelve even numbers then their sum is a)  306 b)  304 c)  302 d)  300

 5. If 8888 + 7777 + 6666 + X = 29000 then the missing X is a)  5659 b)  6669 c)  5669 d)  7669

 6. If 17 × (a + 23) = b × (87 + c) then a + b + c = a)  117 b)  137 c)  127 d)  147

 7. If then a = a)  86 b)  84 c)  74 d)  76

 8. The sum of first five prime numbers is a)  28 b)  27 c)  29 d)  30

 9. Which of the following is/ are false ? i. If a = – 75 then – a = 75 ii. If a + 0 = 0 then a = 0 iii. If b × 1 = 8 then b = 8 a)  i, ii b)  ii, iii c)  i, iii d)  None of these

 10. If 8 × A + 7 × B + 6 × C + 7 × D + 4 = 87674 then A + B + C + D + 4 = a)  11124 b)  11104 c)  11114 d)  11134

 11. The expanded form of 7032 a)  7 × 1000 + 3 × 100 + 20 b)  7 × 1000 + 0 × 100 + 3 × 10 + 2 c)  7 × 1000 + 3 × 100 + 2 d)  none of these

 12. If 57347 + a   is a successor of 57356 34896 + b   is a 5 predecessor of 35908 then a + b + ab + (b – a) = a)  132 b)  133 c)  134 d)  135

 13. On dividing 59761 by a certain number the quotient is 189 and the remainder is 37. Find the divisor a)  314 b)  312 c)  316 d)  318

 14. Find the number which is nearest to 3006 and exactly divisible by 29 a) 3014 b)  3018 c)  3016 d)  3016

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