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Mathematics Class 4 - Computation Operations Notes

Comprehensive study notes for Class 4 - Computation Operations olympiad preparation

Computation Operations

Welcome to the chapter on Computation Operations for Class 4. In this chapter, you will learn how to solve problems using addition, subtraction, multiplication, and division. By the end of this chapter, you will be able to use these operations to solve sums and word problems confidently!

Introduction

Computation operations are the basic math actions we use to solve problems. These include addition, subtraction, multiplication, and division. Let’s learn how to use them!

Addition

Addition means putting numbers together to find the total.

  • Example: 245 + 132 = 377
  • Add numbers with or without carrying.

Subtraction

Subtraction means taking away one number from another to find what is left.

  • Example: 500 - 275 = 225
  • Subtract numbers with or without borrowing.

Multiplication

Multiplication means adding the same number again and again.

  • Example: 23 × 4 = 92
  • Multiply numbers using tables and column method.

Division

Division means sharing or grouping a number into equal parts.

  • Example: 144 ÷ 12 = 12
  • Divide numbers using tables and long division method.

Order of Operations

Sometimes, you need to use more than one operation in a sum. Follow the correct order:

  • Do multiplication and division first.
  • Then do addition and subtraction.

Example: 8 + 6 × 2 = 8 + 12 = 20

Word Problems

Use computation operations to solve real-life problems. Read the question, choose the correct operation, and solve.

  • Example: If you have 3 boxes with 24 pencils each, how many pencils do you have in total? (3 × 24 = 72)

Fun Activity: Operation Race!

Make a list of sums using all four operations. Solve them with your friends and see who finishes first!

Summary

  • Addition, subtraction, multiplication, and division are computation operations.
  • Use the correct order of operations to solve sums.
  • Practice word problems to use math in real life.

Practice Questions

  1. Add: 456 + 789
  2. Subtract: 900 - 475
  3. Multiply: 36 × 5
  4. Divide: 144 ÷ 12
  5. Solve: 7 + 4 × 3

Challenge Yourself

  • Make your own word problem using two operations.
  • Solve: (15 × 2) + (30 ÷ 5)

Did You Know?

  • The order of operations is sometimes called BODMAS or PEMDAS!
  • Computers use computation operations to solve big problems very fast.

Glossary

  • Addition: Putting numbers together.
  • Subtraction: Taking away numbers.
  • Multiplication: Adding the same number many times.
  • Division: Sharing numbers into equal parts.
  • Order of Operations: The rule for which operation to do first.

Answers to Practice Questions

  1. 1245
  2. 425
  3. 180
  4. 12
  5. 19

Practice computation operations every day to become a math master!

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