Playing with Numbers Test

Result

Playing with Numbers Test - 30

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following numbers is divisible by $$3$$?

A
$$561$$

B
$$467$$

C
$$233$$

D
None of these

Solution

We use a rule to check whether the number is divisible by 3 or not.
A number is divisible by 3 if the sum of the digits is evenly divisible by 3.
(a) 561=5+6+1 ___(add the digit)
=12_____(divisible by 3)
(b)467=4+6+7______ (add the digits)
=17______ (not divisible by 3)
(c)233=2+3+3
=8 _______(not divisible by 3)
Question 2
1 / -0

Factor of 30 are :

A
2,3,5

B
1,2,3,5,16

C
1,2,3,10,15

D
1,2,3,5,6
Question 3
1 / -0

Find the factors of $$15$$ using multiplication.

A
$$1,3,5,7,15$$

B
$$1,2,3,5,15$$

C
$$1,5,7,15$$

D
$$1,3,5,15$$

Solution
Question 4
1 / -0

Find the all the factors of $$39$$

A
$$1, 3, 13, 39$$

B
$$1, 3, 39$$

C
$$1, 3, 13$$

D
$$3, 13, 39$$

Solution
Question 5
1 / -0

Which of the pairs are co-primes ?

A
$$15$$ and $$33$$

B
$$24$$ and $$29$$

C
$$17$$ and $$19$$

D
All of above

Solution

If the H.C.F of two numbers are $$1$$ they are said to be co-prime.
In all the cases, we have only one common factor and that is 1.
Hence answer is D.
Question 6
1 / -0

How many prime numbers are there in the following series.
$$1,2,7,9,13,15,21,23,27,29$$

A
7

B
6

C
5

D
4

Solution
Question 7
1 / -0

Which of the following is a prime number

A
391

B
899

C
621

D
199

Solution
Question 8
1 / -0

The factor of 45 is

A
10

B
4

C
5

D
6

Solution

$$45 = 3 \times 3 \times 5$$.
Question 9
1 / -0

Which one of the following is a common factor of $$15$$ and $$12$$.

A
$$2$$

B
$$4$$

C
$$5$$

D
$$3$$
Question 10
1 / -0

The least number of 4-digits which is exactly divisible by 9 is

A
1008

B
1009

C
1026

D
1018

Solution

We use a rule to check whether the number is divisible by 9 or not.
A number is divisible by 9 if the sum of the digits is evenly divisible by 9.
Sum of digits of $$1008$$ is $$1+0+0+8=9$$, which is divisible by 9 hence $$1008$$ is divisible by 9.

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Re-Attempt Weekly Quiz Competition

Playing with Numbers Test - 30

Result

Playing with Numbers Test - 30

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SHARING IS CARING

Question 1

$$561$$

$$467$$

$$233$$

None of these

Solution

Question 2

2,3,5

1,2,3,5,16

1,2,3,10,15

1,2,3,5,6

Question 3

$$1,3,5,7,15$$

$$1,2,3,5,15$$

$$1,5,7,15$$

$$1,3,5,15$$

Solution

Question 4

$$1, 3, 13, 39$$

$$1, 3, 39$$

$$1, 3, 13$$

$$3, 13, 39$$

Solution

Question 5

$$15$$ and $$33$$

$$24$$ and $$29$$

$$17$$ and $$19$$

All of above

Solution

Question 6

7

6

5

4

Solution

Question 7

391

899

621

199

Solution

Question 8

10

4

5

6

Solution

Question 9

$$2$$

$$4$$

$$5$$

$$3$$

Question 10

1008

1009

1026

1018

Solution

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