Grade 8 math skills: all released 2024 NAEP item-map results
Compare the 10 released national grade 8 math questions across content areas and three assessment years. Find the underlying skills and related practice.
What this selection shows
The 10 released questions in this report span 11% to 84% receiving full credit in 2024. The lowest value belongs to “Determine how to use different containers to create given volumes” at grade 8. This ranks only these released items by their full-credit rates; it does not establish the hardest math skill overall.
Compare each item with itself across years. Differences between items can reflect wording, scoring rules, response format, and mathematical demands. We do not average them into a topic proficiency score.
Grade 8 · Measurement
1. Determine how to use different containers to create given volumes
Extended constructed response · Calculator available: no · Item M3816CL
Percentage receiving full credit
2019
13%
2022
11%
2024
11%
0–100% scale · rounded published estimates
What to notice
Creating a target volume with given containers is a planning task as well as a measurement task. List the available capacities and explain each fill, empty, or transfer operation. Ordinary prism-volume practice supports units but does not reproduce this container puzzle.
2024 compared with 2022: No statistically significant change reported.
2024 compared with 2019: 2 percentage-point decrease reported.
Related practice is written by K12Worksheets. It is not the original NAEP question and has no national score benchmark.
Grade 8 · Geometry
2. Solve a problem using similarity and proportional reasoning
Selected response · Calculator available: no · Item M223701
Percentage receiving full credit
2019
25%
2022
22%
2024
25%
0–100% scale · rounded published estimates
What to notice
A contextual similarity task requires identifying matching quantities and applying a consistent scale factor. Draw corresponding sides in the same order before setting up a proportion.
2024 compared with 2022: 3 percentage-point increase reported.
2024 compared with 2019: No statistically significant change reported.
Related practice is written by K12Worksheets. It is not the original NAEP question and has no national score benchmark.
Grade 8 · Data analysis, statistics, and probability
3. Estimate a total amount from a bar graph
Selected response · Calculator available: no · Item M349401
Percentage receiving full credit
2019
32%
2022
29%
2024
29%
0–100% scale · rounded published estimates
What to notice
Estimating a total from a bar graph combines reading scales, approximating values, and adding. State a reasonable interval for the estimate rather than claiming more precision than the graph shows.
2024 compared with 2022: No statistically significant change reported.
2024 compared with 2019: 3 percentage-point decrease reported.
A linear equation in a situation connects a starting amount with a rate of change. Label the variables and units, then explain what the intercept and coefficient mean in the story.
2024 compared with 2022: No statistically significant change reported.
2024 compared with 2019: No statistically significant change reported.
Related practice is written by K12Worksheets. It is not the original NAEP question and has no national score benchmark.
Grade 8 · Number properties and operations
5. Find missing digits in a subtraction problem
Selected response · Calculator available: no · Item D2335MS
Percentage receiving full credit
2019
51%
2022
46%
2024
45%
0–100% scale · rounded published estimates
What to notice
Missing-digit subtraction requires respecting place values and regrouping constraints. Work one column at a time and verify the completed calculation with addition.
2024 compared with 2022: No statistically significant change reported.
2024 compared with 2019: 6 percentage-point decrease reported.
Related practice is written by K12Worksheets. It is not the original NAEP question and has no national score benchmark.
Grade 8 · Number properties and operations
6. Identify greatest number in scientific notation
Selected response · Calculator available: no · Item M223501
Percentage receiving full credit
2019
72%
2022
69%
2024
68%
0–100% scale · rounded published estimates
What to notice
Compare the powers of ten before the leading coefficients when numbers are in normalized scientific notation. A large coefficient does not outweigh a sufficiently smaller exponent.
2024 compared with 2022: No statistically significant change reported.
2024 compared with 2019: 4 percentage-point decrease reported.
Similar triangles have equal ratios between corresponding lengths. Match sides using angles or the diagram’s relationships; apparent orientation alone is not enough.
2024 compared with 2022: No statistically significant change reported.
2024 compared with 2019: 4 percentage-point decrease reported.
Related practice is written by K12Worksheets. It is not the original NAEP question and has no national score benchmark.
Grade 8 · Measurement
8. Convert from kilometers to miles
Selected response · Calculator available: no · Item M233101
Percentage receiving full credit
2019
70%
2022
70%
2024
69%
0–100% scale · rounded published estimates
What to notice
Converting kilometers to miles uses a rate with units. Multiply in the direction that cancels the starting unit and estimate whether the answer is reasonable.
2024 compared with 2022: No statistically significant change reported.
2024 compared with 2019: No statistically significant change reported.
Related practice is written by K12Worksheets. It is not the original NAEP question and has no national score benchmark.
Grade 8 · Algebra
10. Interpret characteristics of a graph within a context
Short constructed response · Calculator available: no · Item M252001
Percentage receiving full credit
2019
88%
2022
87%
2024
84%
0–100% scale · rounded published estimates
What to notice
Features such as a rising section, flat section, or intercept need to be translated back into the context. A graph can show how a quantity changes without describing the physical shape of a journey.
2024 compared with 2022: 3 percentage-point decrease reported.
2024 compared with 2019: 3 percentage-point decrease reported.
Related practice is written by K12Worksheets. It is not the original NAEP question and has no national score benchmark.
Method and limitations
We transcribed the complete released national item-map dataset from the official 2024 mathematics report: 11 questions at grade 4 and 10 at grade 8. This page filters that set by grade. No question was selected because its result looked unusually high or low.
Full credit is not the same as partial credit. NAEP Proficient is also not equivalent to grade-level proficiency. The released questions do not represent every skill taught in either grade, and results cannot diagnose an individual learner.
Official percentage-point changes are based on unrounded estimates, so they can differ from subtracting the displayed percentages. We retain the source’s significance labels and do not infer why a change occurred.