PPT: Arithmetic Expressions | Mathematics Olympiad Class 7 PDF Download

 Page 1


Arithmetic 
Expressions
Page 2


Arithmetic 
Expressions
Arithmetic Expressions
An arithmetic expression is a math phrase that uses:
· Addition (+)
¸ Subtraction (2)
7 Multiplication (×)
¹ Division (÷)
It's a way to combine numbers and operations to solve problems or describe situations.
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Arithmetic 
Expressions
Arithmetic Expressions
An arithmetic expression is a math phrase that uses:
· Addition (+)
¸ Subtraction (2)
7 Multiplication (×)
¹ Division (÷)
It's a way to combine numbers and operations to solve problems or describe situations.
Simple Expressions
An arithmetic expression is a combination of numbers and operations.
 Every expression has a value 4 the final answer it gives.
 We use the equals sign (=) to show this value.
/ Example:
< 1 3 + 2 = 1 5 ' This means the value of the expression is 15.
Page 4


Arithmetic 
Expressions
Arithmetic Expressions
An arithmetic expression is a math phrase that uses:
· Addition (+)
¸ Subtraction (2)
7 Multiplication (×)
¹ Division (÷)
It's a way to combine numbers and operations to solve problems or describe situations.
Simple Expressions
An arithmetic expression is a combination of numbers and operations.
 Every expression has a value 4 the final answer it gives.
 We use the equals sign (=) to show this value.
/ Example:
< 1 3 + 2 = 1 5 ' This means the value of the expression is 15.
Example: Ravi buys 3 notebooks each costing ¹40.
To find the total cost, we write:
 3 × 40 = 120
§ This expression gives us the total money Ravi spends on notebooks.
Different Expressions, Same Value!
The number 20 can be shown in many ways:
' 10 + 10 = 20
' 25 3 5 = 20
' 4 × 5 = 20
' 40 ÷ 2 = 20
Page 5


Arithmetic 
Expressions
Arithmetic Expressions
An arithmetic expression is a math phrase that uses:
· Addition (+)
¸ Subtraction (2)
7 Multiplication (×)
¹ Division (÷)
It's a way to combine numbers and operations to solve problems or describe situations.
Simple Expressions
An arithmetic expression is a combination of numbers and operations.
 Every expression has a value 4 the final answer it gives.
 We use the equals sign (=) to show this value.
/ Example:
< 1 3 + 2 = 1 5 ' This means the value of the expression is 15.
Example: Ravi buys 3 notebooks each costing ¹40.
To find the total cost, we write:
 3 × 40 = 120
§ This expression gives us the total money Ravi spends on notebooks.
Different Expressions, Same Value!
The number 20 can be shown in many ways:
' 10 + 10 = 20
' 25 3 5 = 20
' 4 × 5 = 20
' 40 ÷ 2 = 20
Comparing Expressions
Just like we compare numbers, we can compare expressions using:
= (equal to), > (greater than), < (less than)
We do this by evaluating each expression.
Example -
Compare:
(120 ÷ 4) + 15  and 8 × 5
' Evaluate both:
³ (120 ÷ 4) + 15 = 30 + 15 = 45
³ 8 × 5 = 40
 Since 45 > 40, we write:
(120 ÷ 4) + 15 > 8 × 5