Writing Equations & Expressions

1. Writing Equations & Expressions Notes - 9/17/2012

2. Our Organizer As we go through our notes, pick out any words that might key you into using a specific operation! Example: SUM Write “sum” in addition section.

3. Algebraic Expressions and Equations Variable: any letter that represents an unknown number. The number of students in class minus 2. S = Number of students Expression: 4x + 2 A mathematical phrase that only contains numbers, variable, and operations. Equation: 4x + 2 = 10 + x A mathematical statement that shows to phrases are equal. Vocabulary

4. Translating sentences into equations. Ex 1) Five times the number a squared is three times the sum of b and c. a the sum of Five times squared is three times b and c 5 = 3 (b + c) +, - , , 5 = 3(b+c) Simplify…

5. Twenty-seven times k is h squared decreased by 9. 27k = - 9 Practice

6. The difference of a number and twenty-five is two. K - 25 = 2 Practice

7. 3 (18 - 13) (18 12 - 16 – 7 36 2 (18 + 11) (6 37 +

8. Suppose an adult bottlenose dolphin weighs 800 pounds. This is 735 pounds more than a typical newborn bottlenose dolphin. Which equation could be used to find the weight of a typical newborn bottlenose dolphin? • X – 735 = 800 • X + 735 = 800 • X – 800 = 735 • X + 800 = 735 Practice

9. The big picture…

10. The big picture…

11. Plus • Sum • Total • More than • Increased by Add

12. Minus • Less* • Difference* • Less than* • Decreased by • Subtracted from* Subtract

13. Times • Product • Multiplied • Of • Twice (x2) • Triple (x3) Multiply

14. Divided • Quotient Divide

15. Is equal to • Is • Is the same as • Is identical to • Is as much as Equals

16. The equation for the volume of a cylinder is = The equation for the volume of a cone is = Describe the relationship between the volumes of these two shapes if they have equal bases and heights. Exit Slip