Mathematics Challenge

Mathematics Challenge

9th Grade

30 Qs

quiz-placeholder

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Mathematics Challenge

Mathematics Challenge

Assessment

Quiz

Mathematics

9th Grade

Practice Problem

Hard

Created by

Denella Albert

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30 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Simplify the algebraic expression: 3x + 2y - 5x + 4y

-2x + 2y

8y - 2x

5x - 6y

-2x + 6y

Answer explanation

Combine like terms by adding the coefficients of x and y separately: 3x - 5x = -2x and 2y + 4y = 6y. Therefore, the simplified expression is -2x + 6y.

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Calculate the area of a rectangle with length 8 cm and width 5 cm.

42 square cm

40 square cm

30 square cm

13 square cm

Answer explanation

To calculate the area of a rectangle, multiply the length by the width. In this case, 8 cm * 5 cm = 40 square cm. Therefore, the correct answer is 40 square cm.

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Convert the fraction 3/4 to a decimal.

1.25

0.50

0.75

0.25

Answer explanation

To convert the fraction 3/4 to a decimal, divide 3 by 4 which equals 0.75. Therefore, the correct answer is 0.75.

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In a survey, 60% of students prefer pizza over burgers. If there are 150 students in total, how many prefer pizza?

75

100

120

90

Answer explanation

If 60% prefer pizza out of 150 students, then 0.6 * 150 = 90 students prefer pizza. Therefore, the correct answer is 90.

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the probability of rolling a prime number on a standard six-sided die?

1/5

1/2

1/4

1/3

Answer explanation

To find the probability of rolling a prime number on a standard six-sided die, we identify the prime numbers on a die which are 2, 3, and 5. There are 3 prime numbers out of 6 possible outcomes, so the probability is 3/6 which simplifies to 1/2.

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

If a rectangle has a length of 12 cm and a width of 5 cm, what is its perimeter?

22 cm

40 cm

15 cm

34 cm

Answer explanation

To find the perimeter of a rectangle, we use the formula 2*(length + width). Substituting the values, we get 2*(12+5) = 2*17 = 34 cm. Therefore, the correct answer is 34 cm.

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Solve for x: 2(x + 3) = 16

x = 5

x = 3

x = 8

x = 10

Answer explanation

To solve the equation, first distribute the 2: 2x + 6 = 16. Then, subtract 6 from both sides: 2x = 10. Finally, divide by 2 to find x = 5. Therefore, the correct answer is x = 5.

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