Expressions and Equations

Reba is planning a dinner for 24 people. She wants to make 3 tacos for each person. Taco shells are sold in packages of 12. Which of the following equations can be used to find p, the number of packages of taco shells needed for the dinner?

•  (24 ÷ 3) + 12 = p
•  (24 ÷ 3) x 12 = p
• (24 x 3) x 12 = p
• (24 x 3) ÷ 12 = p

A mechanic repaired 28 cars and 46 trucks last month. He spent 2 hours repairing each of these vehicles. Which equation can be used to find h, the total number of hours the mechanic spent repairing these vehicles?

•  h = (28 + 46) ÷ 2
• h = (28 + 46) + 2
• h = (28 + 46) x 2
•  h = (28 + 46) – 2

Which pair of parentheses can be removed without changing the value of this expression?(1 + 2) x (6 – 3) + (5 x 8) ÷ (9 – 4)

• parentheses around 5 x 8
• parentheses around 1 + 2
• parentheses around 6 – 3
• parentheses around 9 - 4

Brett correctly found the value of expression shown below.5 + 4 x (3 – 1) + 1Which number represents the value Brett found for the expression?

• 14
• 17
• 27
  
• 19

All the minutes used by Mrs. Larson and her 3 children for cell phone calls last month were reported on the same bill. The bill showed that a total of 1,850 minutes had been used last month. Ms. Larson used 462 minutes. Her son used twice as many minutes as she used. Each of her daughters used the same number of minutes.The expression below can be used to find the number of minutes each of Ms. Larson’s daughters used.(1,850 – 462 – 462 x 2) ÷ 2What was the number of minutes each of Ms. Larson’s daughters used?

• 926 minutes
• 1 minute
• 232 minutes
• 1,156 minutes

What is the value of the expression below? 6 x (7-3) + 9

• 78
• 27
  
• 48
• 33

What is the value of the expression if m = 6? 
 7 + 3 x 2 ÷ m

• 3 r 2
• 8
• 16
• 2

What is the value of the expression below? [5 + (3.4 x 2)] x 3

• 50.4
• 25.4
• 35.4
• 21.9

Justin bought two gallons of milk that cost $3.39 per gallon. He paid with a ten dollar bill. When he returned home, he split the change equally with his brother. Which equation below is used to find c, the amount of change each brother received.

• [10 – (3.39 x 2)] ÷ 2 = c
• (10 - 3.39) / 2 = c
• (3.39 x 2 - 10) / 2 = c
• 3.39 - 10 / 2

Each month Chuck’s phone company charges a flat fee of $12 plus $0.05 per minute. His bill for last month was $18. Which equation shows m, the minutes  Chuck talked on the phone last month?

• m = 18 + 12 + 0.05
• 18 - 12 + 0.05 = m
• m = 18 - 12 x 0.05
• 18 = 12 + 0.05 x m