1. Writing expression basic

2. Expressions Some expression 11 = (1 x 10) + 1, 12 = (1 x 10) + 2
In the above numerical expressions we have used
only numbers 1, 2, 3 ...
To form numerical expressions we use addition, subtraction, multiplication and division signs.

3. Algebraic expression
An algebraic expression is a combination of variables and constants connected by arithmetic operations.
Example
m + 8
r – 3

4. x+4 t + 8 Phrase Expression 4 more than number x
Writing algebraic expression that involves addition
Phrase
Expression
4 more than number x
x+4
number y increased by 10
y + 10
8 plus number t
t + 8
the sum of a number w and 12
w + 12

5. 8 - t X - 4 y -10 8 minus number t W -12 Phrase Expression
Writing algebraic expression that involves subtraction
Phrase
Expression
4 less than number x
X - 4
Number y decreased by 10
y -10
8 - t
8 minus number t
the difference between 12 and number w
W -12

6. 4x 2y t 12w Writing algebraic expression that involves multiplication
Phrase
Expression
4 times some number x 4x 2y
twice a number y t
One - third of number t
the product of a number W and 12
12w

7. x y t w Writing algebraic expression that involves division
Phrase
Expression
the quotient of 4 and some number x x y
a number y Divided by 2
the ratio of 8 and some number t t w
the quotient of a number w and 12

8. Try these 10 multiplied by m The quotient of a number x and 10
7 more than number y