1. Writing Algebraic Expressions

2. The product of ten and seven.
Explore-Mini Lesson
Write the following as a
numerical expression.
The product of ten and seven. or
The product of ten and five. or
The product of ten and a number.
VARIABLE
Think…what can we use to represent a number when we don’t know the number?

3. Explore Write the following as a numerical expression.
Numerical Expression: an expression containing one or more numbers and operations i.e. 4+7. or

4. Variable: a letter or symbol that represents an unknown quantity.
Explore- Mini Lesson
Variable: a letter or symbol that represents an unknown quantity.
Now, for my next trick, I will introduce a new way to write multiplication.
Write as a algebraic expression.
The product of ten and a number.
A number written next to a variable means multiplication.

5. Vocabulary Explore- Mini Lesson
This new expression, 10n, is called an Algebraic Expression.
Why do mathematicians call them Algebraic Expressions?
Vocabulary
Algebraic Expression: an expression containing at least one variable.
Numerical Expression: an expression containing one or more numbers and operations.

6. Vocabulary Explore- Mini Lesson
Written Expression: an expression written with words.
The sum seventeen and number
Three times the difference of nine and seven
Variable: any letter in the alphabet or symbol that represents an unknown quantity.

7. Write an algebraic expression for the problems below.
Practice- Whole Class
Write an algebraic expression for the problems below.
Important!!!!
Identify the
operation(s) by underlining key words.
a) The sum of ten and a number.
b) The quotient of a number and twelve.
c) Eleven decreased by five times a number.

8. Assessment- Exit Slip Directions:
1) Write your own algebraic expression using n, 3, 5. You must use at least 2 operations.
2) Translate your algebraic expression into a written expression. 3)
3) Turn and Talk: Read your written expression to your partner. Have your partner write the algebraic expression. Switch roles.