1. Expressions Example

2. Statements Explaination Expression
TYPE 2:
Statements
Explaination
Expression
Add 5 to 7 times a number
Let the number be m
7 times a number m is we
multiply 7 to number m = 7m
So add 5 to 7m
7m + 5
Subtract 5 from 7 times a number
multiply 7 to number m = 7m
So subtract 5 from 7m
7m – 5
One fourth of 7 times a number
So divide 7m by 4
One fifth of 6 times a number

3. Type 3: Forming an expresions
1. If Geetha is ‘x’ years old, What will be the age of Geetha after 7 years?
Answer:
Let the age of Geetha be x
After 7 years means we need to add x to 7
So Geetha’s age after 7 years = x + 7
2. The cost of 1 eraser is Rs.5. What is the cost of ‘n’ erasers?
cost of 1 eraser = Rs.5
Let the number of erasers be n
Therefore, cost of n erasers = 5 x n

4. Try these
I . Write the algebraic expression for the following statement:
Add 3 to a 4 times a number.
Subtract 6 from 3 times a number
8 more than 2 times a number
2 less than 5 times a number
3 times a number divided by 7