Is your child taking O-Level / G3 Computing in Singapore (Syllabus K349)? It’s an exciting subject that opens doors to countless opportunities but can also feel like a maze for students and parents alike.
But worry not! Here’s a quick guide to help you, as a parent, support your child in their computing journey. Plus, a free trial lesson if your child wants expert support. 🌟
How to convert binary to denary
This is G3 Computing (Syllabus K349) learning outcome 1.2.2: converting positive whole numbers between binary, denary and hexadecimal, and describing the technique used.
Each binary digit has a place value. In an 8-bit number, the place values double from right to left:
| 128 | 64 | 32 | 16 | 8 | 4 | 2 | 1 |
Method
- Write the place values above the bits, starting with 1 on the right.
- Pick out the place values that sit above a 1.
- Add those place values together. The total is the denary number.
Worked example 1: 10110101
The 1s sit under 128, 32, 16, 4 and 1.
128 + 32 + 16 + 4 + 1 = 181
Worked example 2: 1101
With 4 bits, the place values are 8, 4, 2 and 1. The 1s sit under 8, 4 and 1.
8 + 4 + 1 = 13
Check by going back: denary to binary
Take 201. Subtract the largest place value that fits, then repeat with what is left.
- 201 − 128 = 73, so the 128 place is 1
- 73 − 64 = 9, so the 64 place is 1
- 32, 16 do not fit, so those places are 0
- 9 − 8 = 1, so the 8 place is 1
- 4 and 2 do not fit, so those places are 0
- 1 − 1 = 0, so the 1 place is 1
201 in binary is 11001001.
Practice questions
- Convert 10010110 to denary.
- Convert 1011 to denary.
Answers: 1) 128 + 16 + 4 + 2 = 150. 2) 8 + 2 + 1 = 11.
For more on how these numbers are used in the exam, read our two’s complement, binary and hexadecimal guide.
1. Familiarize Yourself with the Syllabus:
Understand what the subject entails. No need to become an expert; just knowing the basics will help you guide your child in the right direction. For a closer look at binary and hexadecimal, read our guide to two’s complement, binary and hexadecimal in G3 Computing.
2. Encourage Hands-On Learning:
Computing is best learned by doing. Encourage your child to practice coding, experiment with algorithms, and learn from trial and error.
3. Provide the Right Tools and Resources:
Invest in a good computer, internet connection, and educational software that’ll make learning interactive and fun.
4. Build a Positive Environment:
Encourage open communication, applaud efforts, celebrate achievements, and motivate your child to overcome challenges.
5. Explore Additional Support, Like a Free Trial Lesson:
Sometimes professional guidance can make a huge difference.
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What’s in it for your child?
- Tailored guidance from expert O-Level Computing educators in Singapore.
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Conclusion
Supporting your child in their O-Level Computing journey doesn’t have to be daunting. With understanding, the right tools, a positive approach, and expert guidance, you can help your child unlock their full potential.
Book a free trial lesson and see how your child learns with us. Let’s turn your child’s computing goals into results.
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