MATH STAAR REVIEW
Flashcard
•
Mathematics
•
7th Grade
•
Practice Problem
•
Hard
Polyglots Academy
Used 1+ times
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20 questions
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1.
FLASHCARD QUESTION
Front
If x = 14, which equation is true? Options: 3(20 - x) = 44, 3(12 - x) = 6, 2(x - 3) = 22, 2x - 3 = 22
Back
2(x - 3) = 22
Answer explanation
Substituting x = 14 into 2(x - 3) gives 2(14 - 3) = 2(11) = 22, which is true. The other equations do not hold true when x = 14.
2.
FLASHCARD QUESTION
Front
A circular tablecloth has a radius of 2.5 feet. What is the length of the ribbon needed to go around the edge?
Back
15.7 ft
Answer explanation
To find the length of the ribbon, calculate the circumference of the tablecloth using the formula C = 2πr. With a radius of 2.5 feet, C = 2π(2.5) ≈ 15.7 feet, which is the closest measurement.
3.
FLASHCARD QUESTION
Front
Probability of selecting a blue marble from each of Tara's two bags: Bag 1 (6 red, 5 blue, 4 green), Bag 2 (3 red, 2 blue, 4 green).
Back
2/27
Answer explanation
To find the probability of selecting a blue marble from each bag, calculate: (5/15) for the first bag and (2/9) for the second bag. Multiply these probabilities: (5/15) * (2/9) = 10/135 = 2/27. Thus, the answer is 2/27.
4.
FLASHCARD QUESTION
Front
The price of a video game was reduced from $60 to $45. By what percentage was the price of the video game reduced?
Back
25%
Answer explanation
The price was reduced by $15 ($60 - $45). To find the percentage reduction, divide the reduction by the original price: ($15 / $60) * 100 = 25%. Thus, the price was reduced by 25%.
5.
FLASHCARD QUESTION
Front
30.16 = 17.56 + 5x
Back
2.52
Answer explanation
To solve for x, subtract 17.56 from both sides: 30.16 - 17.56 = 5x. This gives 12.6 = 5x. Dividing both sides by 5 results in x = 2.52, which is the correct answer.
6.
FLASHCARD QUESTION
Front
Probability of first guest seated at a red tablecloth table? (4 red, 8 white tables)
Back
1/3
Answer explanation
There are 4 red tables and 8 white tables, totaling 12 tables. The probability of the first guest sitting at a red table is 4 red tables out of 12 total tables, which simplifies to 1/3.
7.
FLASHCARD QUESTION
Front
A doctor has an annual income of $152,125. The income tax the doctor has to pay is 6%. What is the amount of income tax in dollars and cents that the doctor has to pay?
Back
$9,127.50
Answer explanation
To find the income tax, multiply the annual income of $152,125 by the tax rate of 6% (0.06). This gives $152,125 * 0.06 = $9,127.50, which is the correct answer.
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