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Delaware State Assessments · DeSSA · Math · Grade 8

Delaware Grade 8 DeSSA Math Practice Test

Build Grade 8 Delaware DeSSA Math readiness with five focused 10-question practice sets covering rational numbers, algebra, functions, geometry, statistics, probability, and problem solving.

Grade 8 DeSSA Math practice sets

This Delaware Grade 8 DeSSA Math Practice Test page provides five short practice sets with 10 original multiple-choice questions each. The sets cover rational numbers, expressions, equations, functions, geometry, measurement, statistics, probability, and integrated problem solving.

Skills covered

  • Rational numbers, exponent rules, square roots, scientific notation, equivalent expressions, equations, inequalities, ratios, and unit rates
  • Function evaluation, slope, linear equations, intercepts, systems, graphs, relations, proportional functions, and comparing representations
  • Angle relationships, triangles, the Pythagorean theorem, volume, similarity, circles, trapezoids, transformations, parallel lines, and distance
  • Mean, median, range, sampling, probability, associations, interquartile range, graph scales, and outliers
  • Grade 8 review tasks combining decimals, percent change, function machines, perimeter, probability, residuals, sequences, volume, and representative samples

How to use this page

Complete one 10-question set at a time. Write down the operation or representation you used, check units and signs, and review the explanation after each response.

This is supplemental State Test Practice, State Assessment Practice, and Standardized Test Practice. It does not replace current Delaware Department of Education guidance, official DeSSA materials, accommodations, or testing policies.

For the Delaware assessment hub, visit Delaware State Assessments.

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3. Test

Delaware Grade 8 DeSSA Math Practice Questions

A 10-question Delaware Grade 8 DeSSA Math practice set on geometry and measurement, with answers and explanations.

Read each problem carefully, choose one answer, and review the explanation after responding.

10 Questions
0/10 Questions0 %
Correct 0
Incorrect 0
Unanswered 10
1. QuestionMultiple choice

Two angles form a straight line. If one angle measures 67 degrees, what is the measure of the other?

Please select an answer first.

Correct answer: A

The correct answer is 113 degrees.

  1. Identify the structure: Read the quantities, relationships, diagram information, table, or equation before choosing an operation.
  2. Show the reasoning: Supplementary angles total 180 degrees, so 180 minus 67 equals 113 degrees.
  3. Check the result: Confirm that the answer is reasonable and matches the Delaware Grade 8 DeSSA Math task.

Supplementary angles total 180 degrees, so 180 minus 67 equals 113 degrees.

2. QuestionMultiple choice

A triangle has angles measuring 45 degrees and 65 degrees. What is the measure of the third angle?

Please select an answer first.

Correct answer: B

The correct answer is 55 degrees.

  1. Identify the structure: Read the quantities, relationships, diagram information, table, or equation before choosing an operation.
  2. Show the reasoning: Triangle angles total 180 degrees; 180 minus 45 minus 65 equals 70 degrees.
  3. Check the result: Confirm that the answer is reasonable and matches the Delaware Grade 8 DeSSA Math task.

Triangle angles total 180 degrees; 180 minus 45 minus 65 equals 70 degrees.

3. QuestionMultiple choice

A right triangle has legs of length 6 and 8. What is the length of the hypotenuse?

Please select an answer first.

Correct answer: C

The correct answer is 12.

  1. Identify the structure: Read the quantities, relationships, diagram information, table, or equation before choosing an operation.
  2. Show the reasoning: Using the Pythagorean theorem, the hypotenuse squared is 36 plus 64, or 100, so the length is 10.
  3. Check the result: Confirm that the answer is reasonable and matches the Delaware Grade 8 DeSSA Math task.

Using the Pythagorean theorem, the hypotenuse squared is 36 plus 64, or 100, so the length is 10.

4. QuestionMultiple choice

What is the volume of a rectangular prism with length 3, width 4, and height 5 units?

Please select an answer first.

Correct answer: D

The correct answer is 12 cubic units.

  1. Identify the structure: Read the quantities, relationships, diagram information, table, or equation before choosing an operation.
  2. Show the reasoning: Volume equals length times width times height: 3 times 4 times 5 equals 60 cubic units.
  3. Check the result: Confirm that the answer is reasonable and matches the Delaware Grade 8 DeSSA Math task.

Volume equals length times width times height: 3 times 4 times 5 equals 60 cubic units.

5. QuestionMultiple choice

Two similar triangles have a scale factor of 3 over 2 from the smaller to the larger. If a smaller side is 8, what is the corresponding larger side?

Please select an answer first.

Correct answer: A

The correct answer is 12.

  1. Identify the structure: Read the quantities, relationships, diagram information, table, or equation before choosing an operation.
  2. Show the reasoning: Multiply the smaller side by 3 over 2: 8 times 3 over 2 equals 12.
  3. Check the result: Confirm that the answer is reasonable and matches the Delaware Grade 8 DeSSA Math task.

Multiply the smaller side by 3 over 2: 8 times 3 over 2 equals 12.

6. QuestionMultiple choice

Using 3.14 for pi, what is the circumference of a circle with radius 5 units?

Please select an answer first.

Correct answer: B

The correct answer is 15.7 units.

  1. Identify the structure: Read the quantities, relationships, diagram information, table, or equation before choosing an operation.
  2. Show the reasoning: Circumference equals 2 times pi times radius: 2 times 3.14 times 5 equals 31.4 units.
  3. Check the result: Confirm that the answer is reasonable and matches the Delaware Grade 8 DeSSA Math task.

Circumference equals 2 times pi times radius: 2 times 3.14 times 5 equals 31.4 units.

7. QuestionMultiple choice

What is the area of a trapezoid with bases 8 and 12 units and height 5 units?

Please select an answer first.

Correct answer: C

The correct answer is 40 square units.

  1. Identify the structure: Read the quantities, relationships, diagram information, table, or equation before choosing an operation.
  2. Show the reasoning: Area equals one half times the sum of the bases times height: one half times 20 times 5 equals 50.
  3. Check the result: Confirm that the answer is reasonable and matches the Delaware Grade 8 DeSSA Math task.

Area equals one half times the sum of the bases times height: one half times 20 times 5 equals 50.

8. QuestionMultiple choice

A point (2, negative 3) is reflected across the x-axis. What are the new coordinates?

Please select an answer first.

Correct answer: D

The correct answer is (negative 2, negative 3).

  1. Identify the structure: Read the quantities, relationships, diagram information, table, or equation before choosing an operation.
  2. Show the reasoning: A reflection across the x-axis keeps x and changes the sign of y, giving (2, 3).
  3. Check the result: Confirm that the answer is reasonable and matches the Delaware Grade 8 DeSSA Math task.

A reflection across the x-axis keeps x and changes the sign of y, giving (2, 3).

9. QuestionMultiple choice

Which line is parallel to y equals one half x plus 4?

Please select an answer first.

Correct answer: A

The correct answer is y equals one half x minus 7.

  1. Identify the structure: Read the quantities, relationships, diagram information, table, or equation before choosing an operation.
  2. Show the reasoning: Parallel lines have equal slopes, and the first equation also has slope one half.
  3. Check the result: Confirm that the answer is reasonable and matches the Delaware Grade 8 DeSSA Math task.

Parallel lines have equal slopes, and the first equation also has slope one half.

10. QuestionMultiple choice

What is the distance between points (1, 2) and (4, 6)?

Please select an answer first.

Correct answer: B

The correct answer is 4 units.

  1. Identify the structure: Read the quantities, relationships, diagram information, table, or equation before choosing an operation.
  2. Show the reasoning: The horizontal and vertical changes are 3 and 4, so the distance is the square root of 9 plus 16, or 5.
  3. Check the result: Confirm that the answer is reasonable and matches the Delaware Grade 8 DeSSA Math task.

The horizontal and vertical changes are 3 and 4, so the distance is the square root of 9 plus 16, or 5.

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Frequently asked questions about Delaware Grade 8 DeSSA Math Practice

Which grade is covered?

This page is organized for Grade 8 Delaware DeSSA Math practice, with algebra, functions, geometry, statistics, probability, and problem-solving tasks.

How many questions are included?

There are five practice sets with 10 questions each, for 50 questions in total. Each set can be completed separately.

Are these official DeSSA questions?

No. These are original supplemental practice questions. Check the latest Delaware Department of Education and official DeSSA information for current materials, accommodations, and policies.