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You did these with your group. Now do them on your own — the model above is yours to copy.

1. 1

   Same stepsFinish what the group started. Use the model above, step for step.

   Let's do one together: The field day committee buys one $4.25 item for each student. Shipping costs $23.50, paid one time. Write an expression for the total cost. Then find the cost for 30 students. Choose a letter for the number of students. (s = the number of students) Write the cost of the items. (4.25s) Add the shipping fee. What is the expression? (4.25s + 23.50) Substitute s = 30. What is the total cost? (4.25 × 30 + 23.50 = 127.50 + 23.50 = 151)

   My first step is ___ , because the problem asks for ___ .

   Show your work
2. 2

   Warm restartIn the expression 4 + 6 ÷ 2, which operation do you do first?

   1. AAdd 4 and 6
   2. BDivide 6 by 2
   3. CEither order gives the same answer
   4. DSubtract
3. 3

   Warm restartA square room has sides of 7 feet. Which expression gives its area, and what is the value?

   1. A2⁷ = 128
   2. B7² = 49
   3. C7 × 2 = 14
   4. D7 + 7 = 14
4. 4

   Warm restartEvaluate: 5 + 3 × 2²

   1. A17
   2. B26
   3. C32
   4. D64

You answered these out loud. Now write them.

Answer, then say how you know — the reason is the part that counts.

1. 5

   Think it throughWhich expression models the total cost for h hours?

   1. A8 + 25h
   2. B25 + 8h
   3. C25h + 8h
   4. D33h

   Why is that the answer?

   I chose ___ because ___ .
2. 6

   Think it throughWhat is the total cost for 6 hours?

   1. A$33
   2. B$48
   3. C$73
   4. D$198

   How do you know?

   I chose ___ because ___ .
3. 7

   Think it throughIn 25 + 8h, what is the coefficient?

   1. A25
   2. B8
   3. Ch
   4. D25h

   Explain your thinking.

   I chose ___ because ___ .
4. 8

   Back to the modelWhat key words helped you decide which operation to use? How can the same phrase be written differently?

   The phrase '___ ' tells me to use ___ because the key word ___ means ___.

Use the words

Fill each blank with a word from the bank.

• A letter that stands for an unknown number is a ___.
• A math phrase with variables, numbers, and operations but no equal sign is an ___.
• The number multiplied by a variable, like the 7 in 7n, is the ___.
• A term that is just a number and never changes, like the 5 in 3x + 5, is a ___.

Explain the thinking

1. 9

   Find the mistakeAnother student made this exact mistake in this lesson. Explain why it is wrong, then write what they should have done.

   The mistake: A common mistake in Write Algebraic Expressions is treating 'each' or 'per' as if it means add instead of multiply, and attaching the variable to the wrong number.
2. 10

   Say moreHow do you turn words into an expression? Why does '12 less than a number g' become g − 12 and not 12 − g?

   The words '___' mean ___, so the expression is ___.
3. 11

   Change one numberGo back to Part 1 and pick one problem you already solved. Change one number in it, then solve your new version. Show every step.

   If ___ changed to ___ , then ___ .

   Show your work

Last check

These two come from Lesson 6.4. If they are shaky, that is the lesson to revisit — not this one.

1. 12

   Show what you knowQuick check — you've got this: A club orders one $4.25 shirt for each student plus a one-time $23.50 shipping fee. Write the expression for s students, then find the cost for 30 students.

   1. A4.25s + 23.50; for s = 30 the cost is $151.00
   2. B4.25s + 23.50; for s = 30 the cost is $832.50
   3. C4.25 + 23.50s; for s = 30 the cost is $709.25
   4. D27.75s; for s = 30 the cost is $832.50

   Explain your choice.

   I know it is ___ because ___ .
2. 13

   From Lesson 6.4Quick check — you've got this: Evaluate 2 × 15 + 8 × 2³.

   1. A94
   2. B124
   3. C150
   4. D736
3. 14

   From Lesson 6.4What does the 1.75 represent?

   1. AThe base fee
   2. BThe total cost
   3. CThe number of miles
   4. DThe cost per mile, multiplied by the number of miles

Be honest — this tells your teacher what to do next