1. Review
Simplify
8 – 120 ÷ 5 • 6 + 7
1792 ÷ 32
- 3 – 2 | 5 – 7 |

2. Review 2
Solve the equation 4) x – 3 = ) 4x – 12 = - 56

4. Mathematical Expressions. Page 172
Chapter 3 Section 1
Mathematical Expressions. Page 172

5. Definition Variable: symbol that stands for a value that may vary.
Mathematical Expression: Combination of numbers, and variables using operations of addition, subtraction, multiplication, division, exponents.

6. Example Variable: x, y, d, t Mathematical Expression: a, x + 5, y2
Not valid:
, (2

7. Words to Math Addition Plus Sum More than Greater than Subtraction
Difference
Minus
Subtracted from

8. Mathematical Expression
12 larger than x 12 + x 11 less than y y – 11 x decreased by 9 x - 9

9. Words to symbols Sum of x and 12 4 greater than b 6 more than y
44 plus r
3 larger than x
x b 6 + y 44 + r 3 + x

10. Words to symbols Difference of x and 12 4 less than b
7 subtracted from y
44 minus r
3 smaller than z
x – 12
b – 4
y – 7
44 – r
z - 3

11. Write into mathematical expressions
12 larger than x
11 less than y
r decrease by 8
y more than 12

12. Words to Math Multiplication Product Times multiply Division Quotient
Divide

13. Words to Symbols
Product of x and 12
4 times b
Twice r
12x 4b 2r

14. Words to symbols Quotient of x and 12 4 divided by b
The ratio of 44 to r

15. Write as a mathematical expression
11 times x
Quotient of y and 4
12 divided by p

16. Mathematical symbol
Equal sign = is
are

17. Try
Let the first number equal x. The second number is 3 more than twice the first number. Express the second number in terms of the first number x

18. Summary Vocabulary Change English to mathematical expressions Variable