Simplifications | Laws of Operations | Grade 3 Mathematics
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Operations

Simplifications for Class 3 Math

Here the student will be introduced to the simplifications. Also, they will learn about arithmetic expressions and the order of operations.

The student will learn to

  • Identify arithmetic expressions
  • Apply order of operations
  • Use commutative law and associative law
  • Apply order of operations to solve simplification problems.

The learning concept has been explained to the class 3 students with examples, illustrations and a concept map. At the end of the page, two printable simplifications worksheets with solutions are attached for the students.

Download the worksheets and solutions to assess our knowledge of the concept.

We already know about the operations on numbers. Here we will discuss the simplification of arithmetic expressions involving numbers.

Arithmetic Expressions

An Arithmetic expression in math is a combination of operations (addition, subtraction, multiplication, division) and terms. There are different types of Arithmetic expressions.

Following are examples of some arithmetic expressions.

Examples:

arithmetic expressions

Orders of Operations

To simplify any arithmetic expression, we need to know the order of operations, that should be followed.

  1. First, do the operations in brackets.
  2. Multiplication and division should be done prior to any operations.
  3. Then addition and subtraction should be done after multiplication and division.
order of operations

Examples:

Simplify the followings.

  1. (62 ÷ 2 – 3) × 3 + 6 =
  2. 3 + 21 × 6 – (24 – 4) × 2 =

Answer:

  1. (62 ÷ 2 – 3) × 3 + 6
  2. 3 + 21 × 6 – (24 – 4) × 2
order of operations

Laws of Operations

There are some laws which govern the order in which we perform the operations in arithmetic.

  • Commutative law
  • Associative law

Commutative Law:

The order of the numbers does not affect the result in addition, and in multiplication.

commutative law

Commutative law is not applicable for subtraction and division.

Examples:

  1. For addition, commutative law
  2. For multiplication, commutative law

This law is not applicable to subtraction and division.

non commutative

Associative Law

This law states that the three numbers are independent of their grouping for addition and multiplication. Clearly, grouping or combination of three numbers doesn’t affect the result.

Associative law is not applicable for subtraction and division.

Examples:

  1. For addition, associative law
  2. For multiplication, associative law

This law is not applicable to subtraction and division.

non associative

Application:

Examples 1:

Simplify.

simplification law

Answer:

associative law associative law

Examples 2:

word problem

Answer:

From grade 3:

249 – 200 students are not going to the summer camp.

From grade 2:

238 – 150 students are not going to the summer camp.

From grade 1

98 – 50 students are not going to summer camp

So, the total number of students who don’t want to go to the summer camp is

249 – 200 + 238 – 150 + 98 – 50

= 49 + 88 + 48

= 137 + 48 = 185

word problem

Answer:

Five brothers have given a total of (5 × Rs 60)

Two sisters have given a total of (2 × Rs 50)

The total amount in the fund

(5 × Rs 60) + (2 × Rs 50)

Each child will get

[(5 × Rs 60) + (2 × Rs 50)] ÷ 8

= (Rs 300 + Rs 100) ÷ 8

= Rs 400 ÷ 8

= Rs 50

Did-you-know

Simplification_Mind-Map
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