Full & Half Subtractor Quiz

What is borrowing in subtraction?

• Process of taking from the next higher place value

• Multiplying the next higher place value

• Ignoring the next higher place value

• Adding to the next lower place value

When do we need to borrow in subtraction?

• When the result of subtraction is positive.

• When the digit in the subtrahend is larger than the corresponding digit in the minuend.

• When the minuend is smaller than the subtrahend.

• When the digit in the subtrahend is smaller than the corresponding digit in the minuend.

How does a half subtractor circuit work?

• It works by multiplying the minuend and the subtrahend

• It works by adding the minuend and the subtrahend

• It works by dividing the minuend and the subtrahend

• It works by taking two input bits, the minuend and the subtrahend, and produces two outputs: the difference and the borrow.

What are the components of a half subtractor circuit?

• XNOR gate and a NAND gate

• NAND gate and a NOR gate

• XOR gate and an AND gate

• OR gate and a NOT gate

Explain the working of a full subtractor circuit.

• A full subtractor circuit only consists of one half subtractor and an AND gate.

• The first half subtractor in a full subtractor circuit adds the minuend and subtrahend.

• A full subtractor circuit is used to add three input bits together.

• A full subtractor circuit is used to subtract three input bits: minuend, subtrahend, and borrow. It consists of two half subtractors and an OR gate. The first half subtractor subtracts the minuend and subtrahend to produce a difference and a borrow. The second half subtractor then subtracts the difference from the first half subtractor and the borrow input to produce the final difference and borrow output.

What are the differences between a half subtractor and a full subtractor circuit?

• A half subtractor circuit is more complex and requires more components than a full subtractor.

• A half subtractor circuit can handle borrow input from the previous stage, while a full subtractor cannot.

• A full subtractor circuit can handle borrow input from the previous stage, while a half subtractor cannot.

• A full subtractor circuit can only subtract two bits at a time, while a half subtractor can subtract multiple bits.

Create a truth table for a half subtractor.

• The correct answer is to provide the truth table for a half subtractor.

• Draw the circuit diagram for a full adder

• Explain the concept of binary addition

• Provide the addition table for a half subtractor

What are the inputs and outputs in the truth table for a half subtractor?

• A, B, D, Bout

• X, Y, Z, Carry

• In, Out, Sum, Overflow

• P, Q, R, S

Construct a truth table for a full subtractor.

• I will construct the truth table for a full subtractor by only considering the input bit A.

• I will construct the truth table for a full subtractor by using addition instead of subtraction.

• I will construct the truth table for a full subtractor by ignoring the Borrow In.

• I will construct the truth table for a full subtractor by considering all possible combinations of input bits (A, B, and Borrow In) and then calculating the corresponding outputs (Difference and Borrow Out).

What are the inputs and outputs in the truth table for a full subtractor?

• Sum, Borrow

• B, A

• D, Bout

• A, Cin