Composition book out

Warm-upWhat is your goal for this week in

math?

Warm-up

Kristen wants to buy a new TV for $1200. She has saved $623.59 for her purchase. How much more does

she need to save to buy the TV?

Answer: $576.41

1.1 Variables & Expressions• Variable: a letter that represents a value that can

change or vary• Coefficient: the number multiplied by the variable• Constant: a number that does not change

30n + 6

• Evaluate: to find the answer• Substitute: to replace a number for a variable

Evaluating expressions

• Substitute the number for the variable & solveX + 6 for x = 13

13 + 619

2x + 3y for x = 15 and y = 122(15) + 3(12)

30 + 3666

1.2 Writing Algebraic expressions

Word phrases expression

+

•A number plus 5•Add 5 to a number•Sum of a number and 5•5 more than a number•A number increased by 5

N + 5

-

• a number minus 11•Subtract 11 from a number•Difference of a number & 11•11 less than a number•A number decreased by 11

N -11

x•3 times a number•3 multiplied by a number•Product of 3 and a number

3n

/•A number divided by 7•7 divided into a number•Quotient of a number an d 7

n/7

Translating word phrases into algebraic expressions

A number n decreased by 11n – 11

Quotient of 3 and a number x3/x

1 more than the product of 12 and p1 + 12p

3 times the sum of x and 13(x +1)

Joke of the DayJoke of the DayA three-year-old had been told several times to get ready for bed. The last time his mom told him, she was every insistent.

His response was, "Yes, Sir!" Since he was talking to his mother (and she is a woman), it was not expected of him to

call her "Sir".

"You would say, 'yes sir,' to a man, I am a lady, and you would say 'Yes Ma'am,' to a lady," Mom said. To quiz him on is lesson;

she then asked him, "What would you say to Daddy?"

"Yes Sir!" was the reply

"Then what would you say to Mama?"

"Yes, Ma'am!" he proudly answered.

"Good boy! Now what would you say to Grandma?"

He lit up and said, "Can I have a cookie?"

Solving a word problemACTION OPERATION POSSIBLE QUESTION

CLUESCombine Add How many altogether?

Combine equal groups Multiply How many altogether?

Separate Subtract How man more? How many less?

Separate into equal groups Divide How many equal groups?

Write an expression & then evaluate

• Monica got a 200 minute calling card & called her brother at college. After talking with him for t minutes, she had t less than 200 minutes remaining on her card. Write an expression to determine the number of minutes remaining on the calling card.

200 – t• If Monica talked with her brother for 55 minutes, how many

minutes does he have left on her calling card?200- t

200- 55145

She has 145 minutes left on her calling card.

Workbook out

• Turn to pg. 1• Do #1 & check your answer w/your

table• Let’s look at #15• Finish #16-18 with your table.

• Turn to pg. 2• Let’s look at #7