Numbers Aptitude Questions & Answers with explanation– Test Paper 4
1) Which of the following is the output of 495 * 495 – 105 * 105?
- 234000
- 360000
- 300000
- 350000
The Correct answer is (1)
Answer with explanation:
Apply formula; (a2 – b2) = (a – b) (a+b)
495 x 495 – 105 x 105
= (4952 – 1052)
= (495 – 105) (495 + 105)
= 390 * 600
= 234000
2) What is the unit digit in the product of 853 * 1346 * 452 * 226?
- 4
- 5
- 6
- 8
The Correct answer is (3)
Answer with explanation:
Pick up the unit digit of each number and multiply them;
3 in 853
6 in 1346
2 in 452
6 in 226
3 * 6 * 2 * 6 = 216 (consider the unit digit in the product)
So, the unit digit in the product of 853 * 1346 * 452 * 226 is 6.
3) If two-third of three-fourth of a number is 34, find the 20% of that number?
- 13
- 13.6
- 14
- 14.6
The Correct answer is (2)
Answer with explanation:
Let the number is X.
As per question;
4) What is the sum of all odd numbers up to 240?
- 14400
- 13400
- 12400
- 11400
The Correct answer is (1)
Answer with explanation:
Number of odd numbers up to 240 =240⁄2= 120
Sum of first n odd numbers = n2
n = 120
Required sum = 1202 = 14400
5) What are the different prime factors of 2400?
- 2
- 3
- 4
- 5
The Correct answer is (B)
Answer with explanation:
L.C.M of 2400 = 2 x 2 x 2 x 2 x 2 x 3 x 5 x 5
The different prime factors are 3 (2, 3 and 5).
Also See the Test Paper 5
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