3.1 WRITING EXPRESSIONS AND EQUATIONS.  Evaluate: Solve to get a numerical value.  Numerical expression: numbers and operations. Ex: 2 + 5 – 4 Ex: 2.

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Presentation transcript:

3.1 WRITING EXPRESSIONS AND EQUATIONS

 Evaluate: Solve to get a numerical value.  Numerical expression: numbers and operations. Ex: – 4 Ex: – 4  Variable expression: numbers, letters, variables. Ex: 2x + 3 Ex: 2x + 3  Variables: letters that take place of numbers. DEFINITIONS  Verbal model: use math symbols and apply to words.  Key Words: Addition: increase by, more than. Addition: increase by, more than. Subtraction: fewer or less than. Subtraction: fewer or less than. Multiplication: of, multiplied by. Multiplication: of, multiplied by. Division: quotient of. Division: quotient of.

Examples of verbal expression Tell me what math you would use. Tell me what math you would use. Product of Product of Increased by Increased by Divided into Divided into Decreased by Decreased by Write out as a math problem. Write out as a math problem. 30 increased by a number The product of 5 and a number The difference of 10 and a number.

Write as variable expression – st. Product of 41 and x Product of 41 and x 17 more than y. 17 more than y. Quotient of a number and 2 Quotient of a number and 2 Sum of 6 and a number Sum of 6 and a number

Write a variable equation Six less than a number is 20 Six less than a number is 20 Three times Jim’s age is 12. Three times Jim’s age is 12.

Write a variable equation Seven more than a number is 14 Seven more than a number is 14 Five times a number of students is 240 Five times a number of students is 240 One half the original price is 13 One half the original price is 13 Twice the number of miles is 18. Twice the number of miles is 18.

Write/Solve expressions A taxi costs $5 for a ride plus.50 per mile. Write and solve and expression if you rode 10 miles. An ice cream cone costs $2.00 plus.25 per topping. Write and solve an expression for someone who got 3 toppings.

Wrap up Any questions or concerns. Any questions or concerns. Ic: Workbook pg. 57 Ic: Workbook pg. 57 Hw: workbook 58 Hw: workbook 58