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Mathematics

Class VI section test of playing with numbers. Gives you a satisfaction that you have completely understood the concepts behind the chapter.

19 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

HCF (a, b) = 21 and LCM (a, b) = 56. If a = 3, then b = ?

  1. 294
  2. 26
  3. 74
  4. 392
  5. None of these
Question 2 Multiple Choice (Single Answer)

Which of the following is divisible by 9?

  1. 32541679
  2. 32564872
  3. 32587416
  4. 32546874
  5. None of these
Question 3 Multiple Choice (Single Answer)

If the product of two numbers is 'k' and their HCF is 'a', then their LCM is

  1. k/a
  2. a/k
  3. ka
  4. k + a
  5. None of these
Question 4 Multiple Choice (Single Answer)

The sum of all prime numbers between 80 and 100 is

  1. 259
  2. 269
  3. 267
  4. 257
  5. None of these
Question 5 Multiple Choice (Single Answer)

Choose the pair of co-prime numbers among the following.

  1. (14, 15)
  2. (14, 16)
  3. (14, 18)
  4. (14, 20)
  5. None of these
Question 6 Multiple Choice (Single Answer)

The number that will be divisible by both 10 & 18 is

  1. 80
  2. 54
  3. 90
  4. 108
  5. None of these
Question 7 Multiple Choice (Single Answer)

Correct prime factorisation for 76 is

  1. 76 x 1
  2. 19 x 4
  3. 19 x 2 x 2
  4. 13 x 4 x 2
  5. None of these
Question 8 Multiple Choice (Single Answer)

Let there be two numbers p and q and let p and q have only two common factors x and y other than 1, such that x > y. Then, the HCF of p and q is

  1. y
  2. x
  3. xy
  4. x/y
  5. None of these
Question 9 Multiple Choice (Single Answer)

Which of the following is not a prime number?

  1. 239
  2. 179
  3. 173
  4. 289
  5. 97
Question 10 Multiple Choice (Single Answer)

Which of the following numbers is not co-prime with 14?

  1. 11
  2. 13
  3. 15
  4. 7
  5. None of these
Question 11 Multiple Choice (Single Answer)

Let the 107th multiple of 15 be 'x' and the 115th multiple be 'y'. Then, the value of (x + y)/10 to the nearest tens is

  1. 33330
  2. 3330
  3. 333
  4. 330
  5. None of these
Question 12 Multiple Choice (Single Answer)

If the 7th positive multiple of 48 is 'x' and the 8th positive multiple is 'y', then the value of xy to the nearest thousand is

  1. 129024
  2. 129000
  3. 129030
  4. 93000
  5. None of these
Question 13 Multiple Choice (Single Answer)

In prime factorisation of a number, the number is expressed as _______ factors of the number.

  1. even
  2. odd
  3. composite
  4. prime
  5. None of these
Question 14 Multiple Choice (Single Answer)

The sum of the prime factors of 1358 to the nearest tens is

  1. 106
  2. 110
  3. 100
  4. 105
  5. None of these
Question 15 Multiple Choice (Single Answer)

Let a, b and c be three numbers such that a : b : c = 1 : 2 : 3. Also, the sum of the three numbers is 66. Then, the value of (a + b)(a + c) will be

  1. 1452
  2. 1815
  3. 1089
  4. 432
  5. None of these
Question 16 Multiple Choice (Single Answer)

If HCF (x, y) = 15 and LCM (x, y) = 200, then the value of xy/30 is

  1. 3000
  2. 300
  3. 1000
  4. 100
  5. None of these
Question 17 Multiple Choice (Single Answer)

In the number 324_586, fill in the blanks with such a digit so that it will make the number exactly divisible by 2.

  1. 2
  2. 3
  3. 4
  4. All of the above
  5. None of these
Question 18 Multiple Choice (Single Answer)

In the number 1635_ , fill in the blank with a suitable number so that new number so obtained becomes divisible by 3.

  1. 2
  2. 4
  3. 0
  4. 5
  5. None of these
Question 19 Multiple Choice (Single Answer)

Let 'x' & 'y' be two numbers such that x and y are relatively co-prime, then the LCM of x and y will be

  1. addition of x & y
  2. multiplication of x & y
  3. division of x & y
  4. subtraction of x & y
  5. None of these
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