## Presentation top top theme: "PRE-ALGEBRA. Variables and Expressions (1-1) number expression: a mathematical expression (number sentence) that contains only numbers and operation symbols."— Presentation transcript:

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1 PRE-ALGEBRA

equal teams ---> What is a numerical expression ." > 2 Variables and Expressions (1-1) numerical expression: a mathematical phrase (number sentence) that has only numbers and also operation signs variable - a letter that means a number Example: x = 4n = 35 algebraic expression - a number sentence that uses numbers, at least one procedure <+, -, x, />, and also at least one change Example: 5 x = 20 n 5 = 7 To analyze words an algebraic expression, you should use operation clues to tell you what to perform with the numbers “Add”itionSubtractMultiplication department sumdifferencemultiplydivide plusminustimes much more thanless thanof enhanced bydecreased byproductquotient togetheraparteach -------------> “ “ equal teams ---> “ “ What is a “numerical expression”? What is a “variable”? What is an “algebraic expression”? exactly how do you analyze words into an algebraic expression?

, and at the very least one change Example: 5 x = 20 n 5 = 7 To interpret words one algebraic expression, you should use operation clues to tell girlfriend what to execute with the numbers add itionSubtractMultiplication division sumdifferencemultiplydivide plusminustimes an ext thanless thanof increased bydecreased byproductquotient togetheraparteach > equal groups ---> What is a numerical expression ." title="What is a variable . What is one algebraic expression . How do you analyze words into an algebraic expression .">Algebraic Expression nine more than a number > y less than a number > n - 4 a number time > z x 3; z 3; 3z a number divided by > k split 12; k / 12 5 time the amount (amount) >5 x (4+c); 5 (4+c); 5(4+c) the 4 to add a number Example: Emily has twice as plenty of cards together Jose." > 3 PRE-ALGEBRA Variables and also Expressions (1-1) words -----------------> Algebraic Expression nine much more than a number-----------------> y + 9 4 much less than a number -----------------> n - 4 a number times 3-----------------> z x 3; z 3; 3z a number divided by 12 -----------------> k split 12; k / 12 5 times the quantity (amount) ----------------->5 x (4+c); 5 (4+c); 5(4+c) of 4 add to a number Example: Emily has actually twice as countless cards together Jose. Then, she buys four more cards for $2 each. Write an algebraic expression for the total amount the cards Emily has. Info not needed -----------------> the price of each map unknown details -----------------> how numerous card Jose has operations-----------------> “twice” = times 2 “buys four more” = to add 4 Words: Emily’s Cards = twice Jose’s cards plus 4Write the equation in words an initial J = number of cards Jose has actually define any unknown amounts E = number of cards Emily’s hasas a letter (variable) Equation: E = 2 J + 4 or E = 2J + 4

Algebraic Expression nine much more than a number > y much less than a number > n - 4 a number times > z x 3; z 3; 3z a number split by > k split 12; k / 12 5 times the amount (amount) >5 x (4+c); 5 (4+c); 5(4+c) the 4 plus a number Example: Emily has actually twice as numerous cards together Jose." title="Then, she buys four an ext cards for $2 each. Create an algebraic expression for the full amount of cards Emily has. Info not essential > the price of each map unknown information > how numerous card Jose has operations > twice = times 2 buys four much more = plus 4 Words: Emily’s Cards = twice Jose’s cards plus 4Write the equation in words an initial J = number of cards Jose has define any unknown quantities E = variety of cards Emily’s hasas a letter (variable) Equation: E = 2 J + 4 or E = 2J + 4.">4 PRE-ALGEBRA identify each expression as a numerical expression or one algebraic expression. Because that an algebraic expression, name the variable. Numerical expression Algebraic expression; t is the variable. A. 7 3 b. 4t Variables and Expressions lesson 1-1 added Examples

5 PRE-ALGEBRA compose an algebraic expression because that the cost of p pens priced in ~ 29¢ each. = variety of pens. Words times Let 29¢ number of pens p The algebraic expression 29 p, or 29p, defines the cost of ns pens. Expression29 p Variables and also Expressions great 1-1 added Examples

6 PRE-ALGEBRA 1.the full of h and also 56 2.three less than d 3.5 lessened by three4.a divided by 7 5 – 3; numeric h + 56; algebraicd – 3; algebraic a ÷ 7; algebraic compose an expression because that each indigenous phrase.

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Then identify each expression together a numeric or an algebraic expression. Variables and also Expressions class 1-1 great Quiz