Do Now 9/7/10 Copy HW in your planner. –Text p.7-8, #12-30 evens, #42-48 evens –Get Letter Signed Open your notebook or binder to a new page and put the.

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Do Now 9/7/10 Copy HW in your planner. –Text p.7-8, #12-30 evens, #42-48 evens –Get Letter Signed Open your notebook or binder to a new page and put the following title at the top. Section 1.1 “Expressions and Variables”

Objective SWBAT evaluate and write expressions

Section 1.1 “Expressions and Variables” Numerical expression consists of numbers and operations (10) ÷ 2

Variable a letter used to represent one or more numbers. a e m k y s t

Variable expression consists of numbers, variables, and operations. 9 + a e ÷ 6 3m 2k - 7 y – 7 3t + 2y

substitute a number for each variable, perform the operations and simplify, if necessary. To EVALUATE A VARIABLE EXPRESSION- Substitute 3 for n. Multiply. 13· n 13· 3 39

Subtract. = 2 Substitute 3 for n. = 3 Divide. Evaluate the expression when n = a.9n = b. n – 1 = 3 – 13 – 13 – 13 – 1 Substitute 2 for y. Multiply. = 12 Evaluate the expression when y = 2. c. 6 y = 6 2 Add. = 6 Substitute 2 for y.. d. y + 4 =

Decimal Review

Adding & Subtracting Decimals Add & subtract decimal numbers by Lining up the decimal point H U N D R E D T H s T E N T H s O n e s Add Line up the decimal points and add as you would two whole numbers. Decimal Review

Practice 1) ) 4.33 – 3.9 1) ) Decimal Review

Multiplying Decimals Find the product x x 1.4 x 1.4 How many decimal places are in each number? 2 decimal places 1 decimal place How many decimal places are in the sum of both numbers? 3 decimal places will then be in the product! Decimal Review

Practice 1) 1.46 x ) 3.04 x 1.6 1)1.46 x )3.04 x _+304__ 4.864

Decimal Division Find the quotient of 2.46 ÷ In both divisor and dividend, move the decimal point the same number of places in the same direction to make the divisor a the divisor a WHOLE number Finished.. Move the decimal point straight up, then divide as you normally would. Decimal Review 6

Homework Text p.7-8, #12-30 evens, #42-48 evens