model 4 finding unit place of a number Section-Wise Topic Notes With Detailed Explanation And Example Questions
MOST IMPORTANT quantitative aptitude - 6 EXERCISES
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Top 255+ Number System Fraction Aptitude Questions Answers »
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Top +299 Aptitude Number System (Find Unit Place) Mcq Quiz »
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The following question based on number system topic of quantitative aptitude
(a) 6
(b) 0
(c) 5
(d) 7
The correct answers to the above question in:
Answer: (b)
Required unit’s digit = Unit’s digit in the product of 7 × 5 × 8 × 3 × 9 = 0
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Read more unit place Based Quantitative Aptitude Questions and Answers
Question : 1
The digit in unit’s place of the product 81 × 82 × 83 × ... × 89 is
a) 8
b) 0
c) 6
d) 2
Answer »Answer: (b)
The digit in unit’s place = unit’s digit in the product 1 × 2 × 3 × .... × 9 = 0.
Question : 2
The last digit of $3^40$ is
a) 9
b) 1
c) 7
d) 3
Answer »Answer: (b)
$3^1 = 3; 3^2 = 9; 3^3 = 27;$
$3^4 = 81; 3^5 = 243 ;$ .....
Remainder on dividing 40 by 4 = 0
∴ Unit’s digit in $3^40$ = 1
Question : 3
The units digit of the expression $25^6251 + 36^528 + 73^54$ is
a) 0
b) 6
c) 4
d) 5
Answer »Answer: (a)
Unit digit in the expansion of $25^6251$
= Unit digit in the expansion of $5^6251$ = 5
$36^528$≡ Unit digit in $6^528$ = 6
Now, $3^1 = 3; 3^2 = 9; 3^3 = 27; 3^4 = 81; 3^5 = 243 ;$....
$73^54 = 73^52 × 73^2$≡ $3^2$ = 9
Required digit = Unit’s digit of the sum 5 + 6 + 9 = 0
Question : 4
The unit digit in 3 × 38 × 537 × 1256 is
a) 8
b) 4
c) 6
d) 2
Answer »Answer: (a)
Unit’s digit in 3 × 38 × 537 × 1256
= Unit’s digit in 3 × 8 × 7 × 6
= 4 × 2 = 8
Question : 5
There is a number consisting of two digits, the digit in the units’ place is twice that in the tens’ place and if 2 be subtracted from the sum of the digits, the difference is equal to $1/6$ th of the number. The number is
a) 23
b) 26
c) 24
d) 25
Answer »Answer: (c)
Ten’s digit of original number = x
Unit’s digit = 2x
Number = 10x + 2x = 12x
According to the question,
3x – 2 = $1/6$ × 12x
3x – 2 = 2x
3x – 2x = 2
x = 2
Number = 12x = 12 × 2 = 24
GET number system PRACTICE TEST EXERCISES
model 1 basic number system
model 2 divisibility, multiples, add and subtract based number system
model 3 fraction of numbers
model 4 finding unit place of a number
model 5 smallest and largest fraction/numbers
model 6 operations of consecutive numbers (odd, even, square, etc.)
number system Shortcuts and Techniques with Examples
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model 1 basic number system
Defination & Shortcuts … -
model 2 divisibility, multiples, add and subtract based number system
Defination & Shortcuts … -
model 3 fraction of numbers
Defination & Shortcuts … -
model 4 finding unit place of a number
Defination & Shortcuts … -
model 5 smallest and largest fraction/numbers
Defination & Shortcuts … -
model 6 operations of consecutive numbers (odd, even, square, etc.)
Defination & Shortcuts …
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