Number Solved Questions For IBPS, SBI and Other Bank Exams - Page 4

You will find 59 problems in 15 pages..

Number Problems Solved Questions (Page 4 of 15)

Question 1

1896 x 1896 = ?
a) 458176 b) 5948316 c)3594816 d)6138896

Answer : c)3594816

Solution:

1896 x 1896 = 18962
= (1900 - 4)2
= (1900)2 + (4)2 - 2x1900x4 (by using the formula (a-b)2 = a2 + b2 - 2ab)
= 3610000 +16-15200
= 3594816


Question 2

58430 x 125 = ?
a) 7303750 b) 7878000 c)7307305 d)7638605

Answer: a) 7303750

Solution:

Given that,

58430 x 125 = 58430 x 53
= 58430 x (10/2)3

= (58430 x 103)/23

= 58430000/8
= 7303750

Hence the answer is 7303750.


Question 3

2732 x 61 = ?
a)185362 b) 166652 c) 136672 d)143362

Answer: b) 166652

Solution:

2732 x 61 = 2732 x (60 + 1)
= 2732 x 60 + 2732 x 1
= 163920 + 2732
= 166652.


Question 4

206 x 206 + 194 x 194 = ?
a)80072 b)57582 c)39852 d)72992

Answer: a)80072

Solution:

206 x 206 + 194 x 194= 2062 + 1942
= (200+6)2 + (200-6)2
= 2 x [(200)2 + 62] ( by using (a+b)2 + (a-b)2 = 2(a2 + b2)
= 2 x [40000 + 36]
= 2 x 40036
= 80072
Hence the answer is 80072.


Number Problems Solved Questions (Page 4 of 15)

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