1. Addition and Subtraction Expressions SWBAT to write word expressions as numerical expressions and vice versa; to write word expressions as algebraic expressions and vice versa

2. What operation words can you come up with? Addition Sum Addends More than Increased by Added to Plus Subtraction Difference Decreased by Less than Subtracted from minus

3. Definitions: Numerical expression – a mathematical phrase (no equals sign) using only numbers and operation signs 25 -5 30 + 1 (29 + 7) x 3

4. Definitions Variable – a symbol, generally a letter, that represents and unknown number x n p

5. Definitions: Algebraic expression – a mathematical phrase (no equals sign) that contains at least one variable X + 7 3 – n 4 * k + l

6. Write each word phrase as a mathematical expression The sum of two and seven 14 less than 100 The difference of 1 and a number 13 subtracted from a number 45 decreased by a number Eight more than a number

7. Write each mathematical phrase as a word sentence 100 - 5 95 + y 7 + 8 M - 65

8. Answers: 10 – 0.5 350 + 70 45 + x X + 12 X – 5 X - 11 The difference of 10 and a number 1 added to a number A number increased by 7.99 35 minus 18.3