Lesson T3.2.2

T3.2.2 Binary addition and binary-decimal conversion Quiz: KS3 Computing, Unit 3

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson T3.2.2, Binary addition and binary-decimal conversion: 20 multiple choice questions for the KS3 Computing (National Curriculum), Unit 3: Boolean logic and binary, written with Revision Ninja.

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The 20 questions

  1. Calculate the binary sum 1011 + 0010.

    • 1001
    • 1101
    • 1100
    • 1110

  2. What is the binary number 1 + 1?

    • 10
    • 1
    • 2
    • 11

  3. Convert 19 from decimal to binary.

    • 10011
    • 10101
    • 11001
    • 01110

  4. Convert the binary number 1100 to decimal.

    • 14
    • 10
    • 8
    • 12

  5. Calculate the binary sum 0110 + 0111.

    • 1011
    • 1000
    • 1111
    • 1101

  6. Calculate the binary sum 0101 + 0011.

    • 0111
    • 1001
    • 1000
    • 1100

  7. What is 1001 + 0001 in binary, written in 4 bits?

    • 1000
    • 1010
    • 0111
    • 1011

  8. Convert 25 from decimal to binary.

    • 11001
    • 10011
    • 11100
    • 10101

  9. Convert the binary number 10110 to decimal.

    • 26
    • 22
    • 20
    • 18

  10. A 4-bit addition 1111 + 0001 gives a result that needs 5 bits. What is this called?

    • Rounding
    • Compression
    • Underflow
    • Overflow

  11. What is the binary carry rule when adding 1 and 1 in one column?

    • Write 2 in the same column
    • Write 1 and carry 1 to the same column
    • Write 1 and carry 0 to the next column
    • Write 0 and carry 1 to the next column

  12. Convert the decimal number 7 into 4-bit binary.

    • 0111
    • 1110
    • 0101
    • 1011

  13. Calculate 1000 + 1000 in binary.

    • 1010
    • 10000
    • 1001
    • 1100

  14. What is the decimal value of the binary sum 11 + 1 (both in binary)?

    • 3
    • 2
    • 5
    • 4

  15. Convert the decimal number 31 into binary.

    • 11110
    • 10111
    • 11011
    • 11111

  16. Calculate the binary sum 1110 + 0001.

    • 10000
    • 1111
    • 1101
    • 1110

  17. Which binary sum gives the decimal result 10?

    • 0011 + 0011
    • 0100 + 0100
    • 0101 + 0101
    • 0010 + 0010

  18. Why must binary addition be checked for overflow in a fixed number of bits?

    • Binary numbers do not need any bits to be stored
    • Binary addition never produces values larger than one bit
    • Overflow only happens to decimal numbers
    • A result larger than the bit limit cannot be stored correctly

  19. Convert the binary number 101 to decimal and add 2.

    • 5
    • 7
    • 8
    • 6

  20. Convert the decimal number 14 to binary.

    • 1011
    • 0111
    • 1101
    • 1110

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