Quantitative Aptitude

Number System and Digits

380 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

In the number 8000, what is the value of the digit 0?

  1. 0

  2. 10

  3. 100

  4. 1000
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In the number 8000, the digit 0 in the hundreds and tens place indicates the absence of hundreds and tens, respectively. Therefore, its value is 0.

Multiple choice

In the number 9090, what is the value of the digit 9 in the tens place?

  1. 9

  2. 90

  3. 900

  4. 9000
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In the number 9090, the digit 9 in the tens place has a value of 90. It is multiplied by its place value, which is 10, to determine its contribution to the overall value of the number.

Multiple choice

In the number 5060, what is the difference between the place value of the digit 5 and the place value of the digit 0?

  1. 10

  2. 100

  3. 1000

  4. 10000
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In the number 5060, the digit 5 is in the thousands place, while the digit 0 is in the hundreds place. The difference between their place values is 1000.

Multiple choice

What is the largest number that can be represented by a 10-digit binary number?

  1. 1023

  2. 1024

  3. 2047

  4. 2048
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The largest number that can be represented by a 10-digit binary number is 1111111111, which is equal to 1023 in decimal.

Multiple choice

What is the smallest number that can be represented by a 10-digit binary number?

  1. 0

  2. 1

  3. 1023

  4. 1024
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The smallest number that can be represented by a 10-digit binary number is 0000000000, which is equal to 0 in decimal.