BASIC ARITHMETIC INTERVIEW QUESTIONS

Most Important Frequently Asked Basic Arithmetic Interview Questions

1. Question 1. On Dividing A Certain Number By 234, We Get 43 As Remainder. If The Same Number Is Divided By 13, What Will Be The Remainder?

   Answer :

   suppose that on dividing the given number by 234,

   we get quotient=x and remainder= 43

   then, number= 234*x+43----->(1).

   => (13*18x)+(13*3)+4

   => 13*(18x+3)+4.

   So, the number when divided by 13 gives remainder=4.

2. Question 2. Find The Remainder When 3^27 Is Divided By 5?

   Answer :

   3^27= ((3^4)^6) * (3^3) = (81^6) * 27 then unit digit of (81^6) is 1 so on multiplying with 27, unit digit in the result will be 7. now, 7 when divided by 5 gives 2 as remainder.

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3. Question 3. How Many Natural Numbers Between 23 And 137 Are Divisible By 7?

   Answer :

   These numbers are 28, 35, 42,…., 133.

   This is in A.P. in which a= 28, d=(3528)= 7 and L=133.

   Let the number of there terms be n. then, Tn=133

   a+(n1)d=133 by solving this we will get n=16.

4. Question 4. 597**6 Is Divisible By Both 3 And 11. The NonzeroDigits In The Hundred’s And Ten’s Places Are Respectively?

   Answer :

   Let the given number be 597xy6.

   Then (5+9+7+x+y+6)=(27+x+y) must be divisible by 3

   And, (6+x+9)(y+7+5)=(xy+3) must be either 0 or divisible by 11. xy+3=0

   => y=x+3 27+x+y)

   =>(27+x+x+3)

   =>(30+2x)

   => x = 3 and y = 6.

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5. Question 5. What Is The Smallest Number Should Be Added To 5377 So That The Sum Is Completely Divisible By 7?

   Answer :

   Divide 5377 with 7 we get remainder as 1. so, add 6 to the given number so that it will divisible by 7.

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6. Question 6. The Difference Of The Cubes Of Two Consecutive Even Integers Is Divisible By Which Of The Following Integers?

   Answer :

   let take 2 consecutive even numbers 2 and 4.

   => (4*4*4)(2*2*2)=648=56 which is divisible by 4.

7. Question 7. If The Sum Of 1st N Integers Is 55 Then What Is N?

   Answer :

   sum=n(n+1)/2

   sum=55

   n^2+n=55*2

   n^2+n110=0

   (n10)(n+11)=0

   n=10,11,neglect negative ans

   answer =10

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8. Question 8. It Is Being Given That (5^32+1) Is Completely Divisible By A Whole Number. Which Of The Following Numbers Is Completely Divisible By This Number?

   Answer :

   Let 5^32=x.

   Then (5^32+1)=(x+1). Let (x+1) be completely divisible by the whole number Y.

   then (5^96+1)=[(5^32)^3+1]=>(x^3+1)=(x+1)(x^2x+1) which is completely divisible by Y.

   since (x+1) is divisible by Y.

9. Question 9. A 4 Digit Number 8a43 Is Added To Another 4 Digit Number 3121 To Give A 5 Digit Number 11b64, Which Is Divisible By 11, Then (a+b)=?

   Answer :

   a+1=b

   => ba=1.

   and 11b64 is divisible by 11

   => (4+b+1)(6+1)=0

   => b2=0

   => b=2.

   so, a=1

   =>(a+b)= 3.

Aptitude Interview Questions

10. Question 10. How Many 4 Digit Numbers Are Completely Divisible By 7?

    Answer :

    4digit

    numbers divisible by 7 are: 1001, 1008, 1015….. 9996.

    This is an A.P. in which a=1001, d=7, l=9996.

    Let the number of terms be n.

    Then Tn=9996. .'. a+(n1)d=9996

    => 1001+(n1)7= 9996

    =>(n1)7=8995

    =>(n1)=8995/7= 1285

    => n=1286.

    .'. number of terms =1286.

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11. Question 11. (11/n)+( 12/n)+(13/n)+…… Up To N Terms=?

    Answer :

    Given sum=(1+1+1+…. to n terms)(1/n+2/n+3/n+…. to n terms)

    = n(n(n+1)/2)/n

    = n(n+1)/2=1/2(n1).

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12. Question 12. Here The Sum Of The Series Is 4+8+12+16+….. =612. Find How Many Terms Are There In The Series?

    Answer :

    This is an A.P. in which a=4, d=4 and Sn=612

    Then, n/2[2a+(n1)d]=612 => n/2[2*4+(n1)*4]=612

    => 4n/2(n+1)=612

    => n(n+1)=306

    => n^2+n306=0

    => n^2+18n17n306=0

    => n(n+18)17(n+18)=0

    => (n+18)(n17)=0

    => n=17.

    Number of terms=17.

Verbal Ability Interview Questions

13. Question 13. If (55^55+55) Is Divided By 56, Then The Remainder Is:?

    Answer :

    (x^n+1) is divisible by (x+1), when n is odd.

    .'. (55^55+1) is divisible by (55+1)=56. when (55^55+1)+54 is divided by 56, the remainder is 54.

14. Question 14. Two Third Of Three Fourth Of A Number Is 24. Then One Third Of That Number Is?

    Answer :

    => (2/3)*(3/4)*x = 24

    => x=48,1/3x = 16

15. Question 15. The Sum Of Digits Of A Two Digit Number Is 13,the Difference Between The Digits Is 5. Find The Number.?

    Answer :

    => x+y=13, xy=5

    Adding these 2x =18

    => x=9, y=4.

    Thus the number is 94

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16. Question 16. The Product Of Two Numbers Is 20. The Sum Of Squares Of The Two Numbers Is 81.find The Sum Of The Numbers.?

    Answer :

    Let the numbers be x,y.

    => x2+y2=81,

    => 2(x+y)=40,

    => (x+y)2=81+40=121,

    => x+y=sqrt(121)=11

17. Question 17. The Sum Of Two Numbers Is 30. The Difference Between The Two Numbers Is 20. Find The Product Of Two Numbers?

    Answer :

    => x+y=30
    => xy=20
    => (x+y)2(xy)2 = 4xy
    => 4xy=302202=500
    => xy=500/4=125

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18. Question 18. Which Of The Following Is Not A Prime Number?

    Answer :

    133 is divisible by 7.

    Rest of numbers is not divisible by any numbers except itself and 1.

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19. Question 19. What Is The Least Number That Must Be Subtracted 2458 So That It Becomes Completely Divisible By 13?

    Answer :

    Divide 2458 by 13 and we get remainder as 1.

    Then 131=12.

    Adding 12 to 2458 we get 2470 which is divisible by 13.

    Thus answer is 1.

20. Question 20. If The Number 24*32 Is Completely Divisible By 6. What Is The Smallest Whole Number In The Place Of *?

    Answer :

    The number is divisible by 6 means it must be divisible by 2 and 3. Since the number has 2 as its end digit it is divisible by 2. Now, 2+4+x+3+2=11+x which must be divisible by 3. Thus x=1

Performance Management Interview Questions

21. Question 21. 1004*1004+996*996=

    Answer :

    = (1004)2+(996)2=(1000+4)2+(10004)2

    = (1000)2 + (4)2 + 2*1000*4 + (1000)2 + (4)2 2*100*4

    = 2000000 +32 = 2000032

22. Question 22. 3621 X 137 + 3621 X 63 = ?

    Answer :

    3621 x 137 + 3621 x 63 = 3621 x (137 + 63)

    = (3621 x 200)

    = 724200

23. Question 23. The Difference Of Two Numbers Is 1097. On Dividing The Larger Number By The Smaller, We Get 10 As Quotient And The 17 As Remainder. What Is The Smaller Number ?

    Answer :

    Let the smaller number be x.

    Then larger number = (x + 1097)

    x + 1097 = 10x + 17

    9x = 1080

    x = 120

24. Question 24. If N Is A Natural Number, Then (7(n2) + 7n) Is Always Divisible By:

    Answer :

    (7n2 + 7n) = 7n(n + 1), which is always divisible by 7 and 14 both, since n(n + 1) is always even.

Reasoning Interview Questions

25. Question 25. 96 X 96 + 84 X 84 = ?

    Answer :

    = 96 x 96 + 84 x 84 = (96)2 + (84)2

    = (90 + 6)2 + (90 6)2

    = 2 x [(90)2 + (6)2]

    =16272

26. Question 26. How Many Of The Following Numbers Are Divisible By 132 ?264, 396, 462, 792, 968, 2178, 5184, 6331

    Answer :

    132 = 4 x 3 x 11

    So, if the number divisible by all the three number 4, 3 and 11, then the number is divisible by 132 also.

    264,396,792 are divisible by 132.

    Required answer =3

27. Question 27. (?) + 2763 + 1254 1967 =26988

    Answer :

    x = 28955 4017

    = 24938.

Aptitude Interview Questions

28. Question 28. How Many Natural Numbers Are There Between 17 And 84 Which Are Exactly Divisible By 6?

    Answer :

    Required numbers are 18,24,30,.....84

    This is an A.P a=18,d=6,l=84

    84=a+(n1)d

    n=12

29. Question 29. If The Product 5465 X 6k4 Is Divisible By 15, Then The Value Of K Is

    Answer :

    5465 is divisible by 5.

    So 6K4 must be divisible by 3.

    So (6+K+4) must be divisible by 3.

    K = 2

30. Question 30. If The Number 13 * 4 Is Divisible By 6, Then * = ?

    Answer :

    6 = 3 x 2.

    Clearly, 13 * 4 is divisible by 2.

    Replace * by x.

    Then, (1 + 3 + x + 4) must be divisible by 3.

    So, x = 1.

31. Question 31. Which Of The Following Numbers Will Completely Divide (36^11 1) ?

    Answer :

    => (xn 1) will be divisible by (x + 1) only when n is even.

    => (36^11 1)

    = {(6^2)^11 1}

    = (6^22 1),which is divisible by (6 +1)

    i.e., 7.

32. Question 32. Which Natural Number Is Nearest To 6475, Which Is Completely Divisible By 55 ?

    Answer :

    (6475/55)

    Remainder =40

    647540=6435

33. Question 33. P Is A Whole Number Which When Divided By 5 Gives 2 As Remainder. What Will Be The Remainder When 3p Is Divided By 5 ?

    Answer :

    Let P = 5x + 2.

    Then 3P = 15x + 6

    = 5(3x + 1 ) + 1

    Thus, when 3P is divided by 5, the remainder is 1.

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34. Question 34. The Sum Of First 75 Natural Numbers Is?

    Answer :

    Formula is n(n+1)/2,

    Here n=75.

    So the answer is 2850

35. Question 35. The Difference Between The Place Values Of Two Eights In The Numeral 97958481 Is?

    Answer :

    Required difference = (8000 80)

    = 7920

36. Question 36. A Number When Divided By The Sum Of 333 And 222 Gives Three Times Their Difference The Quotient And 62 As The Remainder. The Number Is?

    Answer :

    Required number = (333+222)×3×111+62

    = 184877

Technical Support Interview Questions

37. Question 37. Find The Number Which Is Nearest To 457 And Is Exactly Divisible By 11.

    Answer :

    On dividing 457 by 11, remainder is 6.

    Required number is either 451 or 462.

    Nearest to 456 is 462.

38. Question 38. Two Times The Second Of Three Consecutive Odd Integers Is 6 More Than The Third. The Third Integer Is?

    Answer :

    Let the three integers be x, x + 2 and x + 4.

    Then, 2(x+2) = (x + 4) + 6

    => x = 6.

    Third integer = x + 4 = 10.

39. Question 39. A Two Digit Number Is Such That The Product Of The Digits Is 6. When 45 Is Added To The Number, Then The Digits Are Reversed. The Number Is:

    Answer :

    Let the ten's and unit digit be x and 8/x respectively.

    Then, 10x + 6/x + 45 = 10 x 6/x + x

    => 10x2 + 6 + 45x = 60 + x2

    => 9x2 + 45x 54

    = 0

    => x2 + 5x 6

    = 0

    => (x + 6)(x 1)

    = 0

    => x = 1

    So the number is 16

40. Question 40. The Product Of Two Numbers Is 436 And The Sum Of Their Squares Is 186. The Difference Of The Numbers Is:

    Answer :

    Let the numbers be x and y.

    Then, xy = 186 and x2 + y2 = 436.

    => (x y)

    2 = x2 + y2 2xy

    = 436 (

    2 x 186)

    = 64

    => x y

    = SQRT(64)

    = 8.

Estimation Techniques Interview Questions

Topic: Basic Arithmetic Interview Questions