Quantitative Aptitude

Number System and Digits

374 Questions

Number system and digits questions test the ability to manipulate numbers, identify significant digits, and form specific values. These problems often require finding missing digits or determining the properties of large sums. They form a vital component of the quantitative aptitude section.

Number formationMissing digitsSignificant digitsLargest and smallest numbersDigit sum properties

Number System and Digits Questions

Multiple choice

The number of significant digit in 20340 is

  1. 4

  2. 5

  3. 3

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In 20340, if the trailing zero is not significant (most common interpretation), significant digits are 2, 3, 4 (total 4). If it were significant, there would be 5.

Multiple choice

Consider the given two statements S1 and S2 and choose the correct option.

S1: In the number 456238, the place value of the digit 5 is 50,000. S2: In the number 5624389, the face value of the digit 5 is 5.

  1. S1 is true and S2 is false.

  2. S1 is false and S2 is true.

  3. Both S1 and S2 are false.

  4. Both S1 and S2 are true.

  5. None of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

S1: In the number 456238, the place value of the digit 5 is 50,000. Place value of 5 = 5 x 10000 = 50,000 (True)   S2: In the number 5624389, the face value of the digit 5 is 5. Face value of a number is the number itself. (True)

Multiple choice

Which of the following statements is true?

  1. The smallest 3-digit number is 999.

  2. The smallest 3-digit number is 100.

  3. The smallest 2-digit number is 11.

  4. The smallest 2-digit number is 99.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The smallest 3-digit number is 100.