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Grade 9 Logic Gates Worksheet with Answers

Grade 9 (US) · Year 10 (UK) · Class 9 (India) · Computer Science

Unit 4: LogicBoolean Logic & Gates

Working out the outputs of AND, OR, NOT and XOR gates and small logic circuits. This free high school worksheet has 12 questions and a full answer key. Print it or save it as a PDF — every answer is checked by code, not guessed.

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Logic Gates

Grade 9 · Computer Science

Score___ / 12

Name

Class

Date

Learning goal: Boolean Logic & Gates

Directions: Read each question carefully and write your answer on the line. Use the diagram to help you.

RememberLogic gates

AND1 only if bothinputs are 1OR1 if at leastone input is 1NOTflips the input0 → 1, 1 → 0XOR1 if the inputsare different
  1. 1

    Work through the circuit gate by gate. What is the output Q?

    A0B1C0ORXORQ
  2. 2

    Work through the circuit gate by gate. What is the output Q?

    A0B0C1ORANDQ
  3. 3

    Work through the circuit gate by gate. What is the output Q?

    A0B0C0ANDORQ
  4. 4

    Work through the circuit gate by gate. What is the output Q?

    A1B1C1ORXORQ
  5. 5

    Work through the circuit gate by gate. What is the output Q?

    A0B0C1ORXORQ
  6. 6

    Work through the circuit gate by gate. What is the output Q?

    A0B1C1ORANDQ
  7. 7

    Work through the circuit gate by gate. What is the output Q?

    A1B1C0ORANDQ
  8. 8

    Work through the circuit gate by gate. What is the output Q?

    A0B1C1ANDXORQ
  9. 9

    Work through the circuit gate by gate. What is the output Q?

    A1B1C1ORANDQ
  10. 10

    Work through the circuit gate by gate. What is the output Q?

    A1B1C0ANDXORQ
  11. 11

    Work through the circuit gate by gate. What is the output Q?

    A0B0C0ORXORQ
  12. 12

    Work through the circuit gate by gate. What is the output Q?

    A0B1C1ANDORQ

★ Challenge corner for fast finishers

What is the largest whole number you can store in 7 bits?

64132116181412111

How did I do?

Teacher's comments

Free printable worksheets with answer keys · aethelsystems.com/worksheets/computer/9/logic_gates

Answer key (click to show)
  1. 1.1
  2. 2.0
  3. 3.0
  4. 4.0
  5. 5.1
  6. 6.1
  7. 7.0
  8. 8.1
  9. 9.1
  10. 10.1
  11. 11.0
  12. 12.1
  13. ★127 (challenge corner)

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