0478.1.1.12 — (a) Add two positive 8-bit binary integers: past paper questions
Real questions on 0478.1.1.12 — (a) add two positive 8-bit binary integers
The newest 14 of 14 written questions. Open one to see it on the real paper.
- 0478/12 · February/March 2026 · Q6e[3]
Add the two binary integers using binary addition and give your answer in binary. Show all your working. 0 0 0 1 1 0 1 0 + 0 1 1 0 1 1 1 0
See it on the paper → - 0478/11 · October/November 2025 · Q1a[1]
State the highest denary number that could be stored in a single 8-bit register.
See it on the paper → - 0478/11 · October/November 2025 · Q1b[2]
Denary numbers are typed into the calculator. They are converted to binary numbers and stored in the 8-bit registers. The student types in the denary number 23 and the denary number 168. Give the 8-bit binary numbers that are stored in the registers for these two denary numbers. 23 Working space 168
See it on the paper → - 0478/11 · October/November 2025 · Q1c[1]
Give the denary number that will be displayed on the screen for this binary number. 00001011 Working space (c) The result of a calculation that is stored in a register is the binary number 00001011
See it on the paper → - 0478/11 · October/November 2025 · Q1d[1]
Another result of a calculation that is stored in a register is the binary number 01000010 Give the denary number that will be displayed on the screen for this binary number. 01000010
See it on the paper → - 0478/11 · October/November 2025 · Q1e[3]
Two binary numbers stored in the registers are 01110110 and 00110000 Add the binary numbers using binary addition. Show all your working. Give your answer in binary. + 0 1 1 1 0 1 1 0 0 0 1 1 0 0 0 0
See it on the paper → - 0478/12 · October/November 2025 · Q2a[4]
Add the two binary numbers using binary addition. Give your answer in binary. Show all of your working. + 11110101 00111001
See it on the paper → - 0478/12 · May/June 2025 · Q1e[3]
The 8-bit binary numbers 01100101 and 01110000 are stored in RAM. The binary numbers are added together. Add the two binary numbers using binary addition. Give your answer in binary. You must show all your working. + 0 1 1 0 0 1 0 1 0 1 1 1 0 0 0 0
See it on the paper → - 0478/12 · February/March 2025 · Q1b[3]
Two 8-bit binary numbers are given. Add the two 8-bit binary numbers using binary addition. 1 0 0 1 1 0 1 1 + 0 0 0 1 0 0 1 1 Give your answer in binary. Show all your working.
See it on the paper → - 0478/11 · October/November 2024 · Q3d[3]
the two binary numbers using binary addition. Give your answer in binary . Show all your working.
See it on the paper → - 0478/13 · October/November 2024 · Q1d[4]
Binary integers can be added together. Add the two binary integers using binary addition. Show all your working. Give your answer in binary. 1 1 1 0 0 0 1 1 + 1 1 0 0 1 1 0 0
See it on the paper → - 0478/13 · October/November 2023 · Q2e[3]
Add the binary values 00110011 and 01111000 using binary addition. Give your answer in binary. Show all your working.
See it on the paper → - 0478/12 · February/March 2019 · Q3a(i)[2]
The screen currently displays: 0 0 3 9 State the binary value that is currently stored to display the count shown.
See it on the paper → - 0478/12 · February/March 2019 · Q3a(ii)[2]
More competitors cross the finish line and the screen now displays: 0 3 5 0 State the binary value that is currently stored to display the count shown.
See it on the paper →
What examiners said
Comprehensive responses • Many candidates added the two binary numbers accurately and showed their working of binary addition by showing the carries. Limited responses • Some candidates did not show their working or had incomplete working for example only 5 carries.
— Examiner report, February/March 2026, 0478/12 Q6(e) (Cambridge)
Many candidates were able to carry out the correct binary addition. Some candidates did not show their working. Candidates must be reminded that if a question instructs to show all working that some marks will be allocated to this.
— Examiner report, May/June 2025, 0478/12 Q1(e) (Cambridge)
Many candidates correctly added together the two binary numbers. Fewer candidates showed their full working. A small number of responses converted the two binary numbers into denary, added these and then converted the total back into binary. Candidates need to make sure they are clearly showing where the carries are located. If candidates perform the calculation multiple times by rewriting the add...
— Examiner report, February/March 2025, 0478/12 Q1(b) (Cambridge)
Past papers, syllabus and examiner reports © UCLES (Cambridge University Press & Assessment). Questions are matched to topics from the official syllabus. AssessPro is independent and not endorsed by Cambridge.