Number Bases


Welcome to the course material on Number Bases in General Mathematics. This topic delves into the fascinating world of different number systems beyond our everyday base 10 system. Understanding number bases is crucial as it forms the foundation for various mathematical operations and computer science applications.

One of the primary objectives of this topic is to explore the concept of converting numbers from one base to another. In mathematics, a base refers to the number of different digits or combination of digits that a system of counting uses to represent numbers. We will delve into the process of converting numbers expressed in one base to an equivalent value in another base. This conversion requires a solid grasp of place value and the positional notation system.

Additionally, this course material will cover the basic operations performed on number bases. These operations include addition, subtraction, and multiplication of numbers in different bases. Understanding these operations not only enhances computational skills but also sharpens logical reasoning and problem-solving abilities.

Imagine a scenario where you encounter a number expressed in base 5 and need to add it to a number in base 8. Through this course material, you will gain the proficiency to carry out such operations seamlessly. The ability to manipulate numbers in various bases is a valuable skill with practical applications in computer programming, cryptography, and various scientific fields.

As you progress through this material, you will encounter illustrative examples and practice problems to reinforce your understanding of number bases. Embracing the intricacies of different bases will transform your approach to arithmetic and unleash your potential to navigate diverse numerical systems with confidence.


  1. Understand the concept of number bases
  2. Perform basic operations (addition, subtraction, multiplication) on number bases accurately
  3. Convert numbers from one base to another base efficiently

Lesson Note

Understanding number bases is a crucial part of mathematics, particularly in computer science and digital electronics. A number base, or radix, indicates how many unique digits, including zero, a positional numeral system uses to represent numbers. Most familiar to us is the decimal system (base 10), but other systems like binary (base 2), octal (base 8), and hexadecimal (base 16) are also widely used.

Lesson Evaluation

Congratulations on completing the lesson on Number Bases. Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.

You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.

Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.

  1. Convert the number 10111 from base 2 to base 10. A. 23 B. 27 C. 19 D. 29 Answer: B. 27
  2. Convert the number 215 from base 7 to base 10. A. 128 B. 147 C. 135 D. 109 Answer: C. 135
  3. Perform the following addition in base 5: 234 + 113. A. 442 B. 347 C. 324 D. 562 Answer: A. 442
  4. What is the result of subtracting 344 from 1000 in base 8? A. 516 B. 424 C. 634 D. 140 Answer: B. 424
  5. Multiply 23 by 14 in base 5. A. 132 B. 311 C. 443 D. 101 Answer: C. 443

Recommended Books

Past Questions

Wondering what past questions for this topic looks like? Here are a number of questions about Number Bases from previous years

Question 1 Report

In the diagram above, TRQ is a straight line. Find p, if p = 1/3(a + b + c)

Question 1 Report


Practice a number of Number Bases past questions