Kit Library / Mathematics / Electronic Mathematics
⚡ Topic Learning KitNumber Systems
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What you'll study, topic by topic
Electronic Mathematics Unit 1: Number Systems, Codes, and Representations
~8 min · full explanation, examples & memory tricks in the app
Try the smart MCQs from this kit
16 questions laddered from warm-up to topper-level, each with an explanation. A taste:
Which of the following is the base of the hexadecimal number system?
BeginnerShow answer & explanation
16
Hexadecimal is a base-16 number system, using digits 0-9 and letters A-F.
What is the binary equivalent of the decimal number 10?
BeginnerShow answer & explanation
1010
Decimal 10 in binary is 1010 because $1 \times 2^3 + 0 \times 2^2 + 1 \times 2^1 + 0 \times 2^0 = 8 + 0 + 2 + 0 = 10$.
Which of the following is NOT a valid BCD code?
IntermediateShow answer & explanation
1010
BCD (Binary Coded Decimal) uses only the binary patterns 0000 to 1001 to represent decimal digits 0-9. The pattern 1010 represents decimal 10, which is not a single decimal digit, so it is invalid in BCD.
What is the 1's complement of the binary number 1010?
IntermediateShow answer & explanation
0101
The 1's complement is obtained by flipping each bit: 1 becomes 0 and 0 becomes 1. So 1010 becomes 0101.
Study it properly — free, in the app
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