Expressions Example

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

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

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