The document defines expressions as mathematical phrases containing variables and operations. It provides examples of expressions like n - 20, x + 5, and p + 11. The document then explains how to evaluate expressions by substituting values for variables and simplifying. Examples shown are evaluating 6n when n = 3 and when n = 100. Finally, it provides vocabulary terms for mathematical operations and shows how to write word phrases like "50 more than a number" as algebraic expressions.

1. 2-7 Using Expressions
Math Notes
Algebra and Functions 1.2

2. Definitions

3. Definitions
Expression - a mathematical
phrase made up of a variable
and operations

4. Definitions
Expression - a mathematical
phrase made up of a variable
and operations
n - 20

5. Definitions
Expression - a mathematical
phrase made up of a variable
and operations
n - 20
x+5

6. Definitions
Expression - a mathematical
phrase made up of a variable
and operations
n - 20 p + 11
x+5

7. Definitions
Expression - a mathematical
phrase made up of a variable
and operations
n - 20 p + 11
x+5 s-1

8. To Evaluate

9. To Evaluate
To evaluate an expression with
variables, substitute values for
each variable and simplify.

10. Evaluate 6n if n = 3

11. Evaluate 6n if n = 3
6n

12. Evaluate 6n if n = 3
6n
Remember 6n is
the same as 6 x n

13. Evaluate 6n if n = 3
6n
Remember 6n is
the same as 6 x n
6x n

14. Evaluate 6n if n = 3
6n
Remember 6n is
the same as 6 x n
6x n n =3

15. Evaluate 6n if n = 3
6n
Remember 6n is
the same as 6 x n
6x n =3

16. Evaluate 6n if n = 3
6n
Remember 6n is
the same as 6 x n
6x3

17. Evaluate 6n if n = 3
6n
Remember 6n is
the same as 6 x n
6 x 3 = 18

18. Evaluate 6n if n = 100

19. Evaluate 6n if n = 100
6n

20. Evaluate 6n if n = 100
6n
Remember 6n is
the same as 6 x n

21. Evaluate 6n if n = 100
6n
Remember 6n is
the same as 6 x n
6x n

22. Evaluate 6n if n = 100
6n
Remember 6n is
the same as 6 x n
6x n n = 100

23. Evaluate 6n if n = 100
6n
Remember 6n is
the same as 6 x n
6x n = 100

24. Evaluate 6n if n = 100
6n
Remember 6n is
the same as 6 x n
6 x 100

25. Evaluate 6n if n = 100
6n
Remember 6n is
the same as 6 x n
6 x 100 = 600

26. Evaluate 6 if n = 3
n

27. Evaluate 6 if n = 3
n
Remember 6 is
n
the same as 6 ÷ n

28. Evaluate 6 if n = 3
n
Remember 6 is
n
the same as 6 ÷ n
6÷ n

29. Evaluate 6 if n = 3
n
Remember 6 is
n
the same as 6 ÷ n
6÷ n n= 3

30. Evaluate 6 if n = 3
n
Remember 6 is
n
the same as 6 ÷ n
6÷ n= 3

31. Evaluate 6 if n = 3
n
Remember 6 is
n
the same as 6 ÷ n
6÷ 3

32. Evaluate 6 if n = 3
n
Remember 6 is
n
the same as 6 ÷ n
6÷ 3 =2

33. The Vocabulary of Math

34. The Vocabulary of Math
Addition +
sum
increased by
more than a

35. The Vocabulary of Math
Addition + Subtraction -
sum less than
increased by subtracted by
more than a

36. The Vocabulary of Math
Addition + Subtraction - Multiplication X
sum less than the product
increased by subtracted by multiplied by
more than a twice a number

37. The Vocabulary of Math
Addition + Subtraction - Multiplication X Division ÷
sum less than the product divided by
increased by subtracted by multiplied by quotient
more than a twice a number

38. Write each word phrase as an
expression.

39. Write each word phrase as an
expression.
50 more than a number

40. Write each word phrase as an
expression.
50 more than a number

41. Write each word phrase as an
expression.
50 more than a number 50 + n

42. Write each word phrase as an
expression.
50 more than a number 50 + n
10 subtracted by a number

43. Write each word phrase as an
expression.
50 more than a number 50 + n
10 subtracted by a number

44. Write each word phrase as an
expression.
50 more than a number 50 + n
10 subtracted by a number n - 10

45. Write each word phrase as an
expression.
50 more than a number 50 + n
10 subtracted by a number n - 10
the product of 100 and a
number

46. Write each word phrase as an
expression.
50 more than a number 50 + n
10 subtracted by a number n - 10
the product of 100 and a
number

47. Write each word phrase as an
expression.
50 more than a number 50 + n
10 subtracted by a number n - 10
the product of 100 and a
number
100 x n

48. Write each word phrase as an
expression.
50 more than a number 50 + n
10 subtracted by a number n - 10
the product of 100 and a
number
100 x n
50 divided by a number

49. Write each word phrase as an
expression.
50 more than a number 50 + n
10 subtracted by a number n - 10
the product of 100 and a
number
100 x n
50 divided by a number

50. Write each word phrase as an
expression.
50 more than a number 50 + n
10 subtracted by a number n - 10
the product of 100 and a
number
100 x n
50 divided by a number 50 ÷ n