HARD
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The sum of all 3 -digit numbers which are equal to 11 times the sum of squares of their digits is

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Important Questions on Playing with Numbers

MEDIUM

In the question given below, the numbers in the figures are related. Identify their relationships and find the missing numbers in the given figures.

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MEDIUM

Which number will replace the question mark?

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MEDIUM

In the question given below, the numbers in the figures are related. Identify their relationships and find the missing numbers in the given figures.

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MEDIUM
There are exactly twelve Sundays in the period from January 1 to March 31 in a certain year. Then, the day corresponding to February 15 in that year is
EASY

If, in a two-digit number, the digit at unit place is x and the digit at tens place is 4, then the two-digit number is _____.

HARD
Let S be the set of all point ab,cd on the circle with radius 1 centred at 0,0 where a and b are relatively prime integers, c and d are relatively prime integers (that is HCF a,b=HCF c,d=1), and the integers b and d are even. Then the set S
EASY

Select the combination of letters that when sequentially placed in the blanks of the given series will complete the series.

l _ chtlgc _ tlg _ ht _ gc _ tlgch _

EASY

The sum of three consecutive numbers is 126. Find the highest number-

1. 41
2. 42
3. 43
4. 44

MEDIUM
A two-digit number is 4 times the sum of its digits. If 18 is added to the number, the digits are reversed. Find the number.
EASY
If in a certain way, 3  +  4  =  25 and 7  +  24  =  625, then 9  +  40  =  ?
MEDIUM
The number of positive integers n in the set 2,3,..,200 such that 1n has a terminating decimal expansion is
MEDIUM
Consider the set A of natural numbers n whose units digit is non-zero, such that if this units digit is erased, then the resulting number divides n. If K is the number of elements in the set A, then
MEDIUM
The number of digits in the decimal expansion of 165516 is
MEDIUM

In the question given below, the numbers in the figures are related. Identify their relationships and find the missing numbers in the given figures.

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EASY

How many times does the number 3 occur in unit's place for numbers ranging from 1 to 100?

1. 20
2. 11
3. 10
4. 19

EASY

1 USD = Rs. 67.89. A money changer adds a margin of Rs. 1.11. What will be the cost of 150 USD ? 

1. Rs. 10,183
2. Rs. 10,350
3. Rs. 10,330
4. Rs. 10,450

EASY

Twice the difference between two numbers is equal to their sum. If one number is 15, Find the other number.

1. 15
2. 10
3. 5
4. 20 

MEDIUM

Which number will replace the question mark?

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HARD
The number of all 2-digit numbers n such that n is equal to the sum of the square of digit in its tens place and the cube of the digit in units place is
MEDIUM

Consider a three-digit number with the following properties:

I. If its digits in units place and tens place are interchanged, the number increases by 36
II. If its digits in units place and hundreds place are interchanged, the number decreases by 198 .

Now, suppose that the digits in tens place and hundreds place are interchanged. Then, the number