EASY
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What is the sum of two odd numbers.

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Important Questions on Reviewing Number Concepts

MEDIUM

A cake is distributed among 5 friends. Four of them get 18, 16, 512 and 112, and as shares. What part of the cake will be got by the fifth friend?

EASY
What is the least number that should be added to the product of 7×8×9×10 to make it a perfect square?
EASY

Simplify: 19+35÷29+25

(A)3127

(B)3328

(C)78

(D)87

EASY

The simplest form of 273195 is…..?   

HARD
Suppose a,b,c are positive integers such that 2a+4b+8c=328. Then a+2b+3cabc is equal to-
EASY
In an office, 58 of the total number of employees are males and the rest are females. 25 of the number of males are non-technical workers while 23 of the number of females are technical workers. What fraction of the total number of employees are technical workers?
EASY
In a boys school, there are two toilets required per 15 boys. If there are a total of 255 students, then how many toilets will be needed? 
EASY
If a and b are positive integers such that a2-b2 is a prime number, then a2-b2 is equal to:
MEDIUM
For an integer n, let Sn=n+1,n+2,., n+18. Which of the following is true for all n10 ?
EASY

What will be the minimum value of x so that  55x-19 becomes a complete number?

EASY
A two-digit number ab¯ is called almost prime if one obtains a two-digit prime number by changing at most one of its digits a & b. (For example, 18 is an almost prime number because 13 is a prime number). Then the number of almost prime two-digit numbers is
MEDIUM
A number whose fifth part increased by 4 is equal to its fourth part diminished by 10, is:
EASY
A prime number p is called special if there exist primes p1, p2, p3, p4 such that p=p1+p2=p3-p4.
The number of special primes is
 
EASY

Which of the following relation is correct?

EASY
There are four prime numbers written in ascending order. The product of the first three is 385 and that of the last three is 1001. The last number is :
EASY
It is given that the number 43361 can be written as a product of two distinct prime numbers p1, p2. Further, assume that there are 42900 numbers which are less than 43361 and are co-prime to it. Then, p1+p2 is
EASY
A fraction is such that the numerator is five less than the denominator. Also four times the numerator is one more than the denominator. The fraction is:
EASY

What is the fraction which is subtracted from12, the leaves 34?

HARD
The number of 6-digit numbers of the form ababab (in base 10) each of which is a product of exactly 6 distinct primes is
EASY
If a and b are positive integers such that a2-b2 is a prime number, then