
Isolating Variables in Real-World Math Word Problems
Authored by Anthony Clark
English, Mathematics
8th Grade
CCSS covered

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10 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A store sells x notebooks for $p each and charges a flat fee of $q. If the total cost is $r, how can you find the price per notebook?
(r - x) / p
r / (x + q)
(r - q) / x
(r + q) / x
Tags
CCSS.HSA.CED.A.4
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
You have a budget of $r to spend on x items that cost $p each, plus a shipping fee of $q. How can you determine how many items you can buy?
x = (r + q) / p
x = (r - q) / p
x = (r - p) / q
x = (r * p) + q
Tags
CCSS.HSA.CED.A.4
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A car rental company charges a base fee of $q plus $p per day for renting a car. If your total bill is $r, how can you isolate the number of days you rented the car?
d = (r - p) / q
d = (r + q) / p
d = (r - q) / p
d = r / (q + p)
Tags
CCSS.HSA.CED.A.4
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In a recipe, you need p cups of flour and q cups of sugar to make x cookies. If you want to make r cookies, how can you express the amount of flour needed in terms of r?
(p/x) * r
(p + q) * r
(q/x) * r
(p/q) * r
Tags
CCSS.6.EE.C.9
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A gym membership costs $p per month plus a one-time fee of $q. If you want to spend a total of $r, how can you find out how many months you can afford the membership?
(r - p) / q
(r - q) / p
(p + q) / r
(r + q) / p
Tags
CCSS.HSA.CED.A.4
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
You are saving $p each week and have a goal of $r. If you already have $q saved, how can you find out how many weeks it will take to reach your goal?
(r + q) / p
(q - r) / p
(r - p) / q
(r - q) / p
Tags
CCSS.7.EE.B.4A
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A phone plan costs $p per month plus a one-time activation fee of $q. If your total cost for the first month is $r, how can you isolate the monthly fee?
p = r / q
p = r - q
p = r + q
p = r * q
Tags
CCSS.HSA.CED.A.4
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