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Missouri Standards

Missouri 8th Grade Math Standards

All 28 Missouri math standards for 8th grade, each explained in plain English. The official wording is in Missouri Department of Elementary and Secondary Education's document, linked at the end of this page.

28 standards

Number Sense and Operations

2 standards
8.NS.A.1
Tell rational from irrational numbers, explain why rational decimals end or repeat, and switch between repeating decimals and fractions, like 0.27 repeating = 3/11.
8.NS.A.2
Estimate and compare irrational numbers and mark their approximate places on a number line, like the square root of 2 is about 1.41.

Expressions, Equations and Inequalities

8 standards
8.EEI.A.1
Use exponent rules for positive, zero and negative exponents to write equal expressions, like 3² × 3⁻⁵ = 3⁻³ = 1/27.
8.EEI.A.2
Solve x² = p and x³ = p, find square roots of perfect squares up to 625 and cube roots of perfect cubes up to 1,000, and see that other square roots are irrational.
8.EEI.A.3
Write very large and very small numbers in scientific notation and estimate how many times bigger one is, like 3 × 10⁸ is 100 times 3 × 10⁶.
8.EEI.A.4
Add, subtract, multiply and divide numbers in scientific notation, mixing in standard decimals, and pick sensible units, like millimeters per year for sea floor spreading.
8.EEI.B.5
Graph proportional relationships, read the unit rate as the slope, and compare two of them, like two phone plans shown as a graph and an equation.
8.EEI.B.6
Explain why slope stays the same between any two points on a non-vertical line, and derive y = mx for lines through the origin and y = mx + b for others.
8.EEI.C.7
Solve one-variable equations and inequalities with rational coefficients, using distribution and like terms, and spot equations with one, none or infinitely many solutions.
8.EEI.C.8
Solve systems of two linear equations by graphing and algebra, explain why the crossing point is the solution, and why there can be one, none or infinitely many.

Geometry and Measurement

9 standards
8.GM.A.1
Test by experiment that slides, flips and turns keep lengths, angle sizes, and points in a line in the same order, and check whether orientation stays the same.
8.GM.A.2
Explain that two flat figures are congruent when slides, flips and turns can move one exactly onto the other, and describe a sequence that does it.
8.GM.A.3
Describe what happens to a figure's coordinates when it is slid, turned, flipped or scaled up or down.
Common Core 8.G.3
8.GM.A.4
Show that figures are similar when a mix of rotations, reflections, translations and dilations carries one onto the other, and name a sequence that does it.
8.GM.A.5
Reason informally about angle sums and exterior angles of triangles and parallel lines cut by a transversal, and use similar figures to solve problems.
8.GM.B.6
Use models or diagrams to show why the Pythagorean Theorem and its converse are true, like rearranging squares on a right triangle's sides.
8.GM.B.7
Find missing side lengths of right triangles with the Pythagorean Theorem in flat and 3D problems, like the diagonal of a box or the height of a ladder.
8.GM.B.8
Find the distance between two points on a coordinate plane with the Pythagorean Theorem, like from (1, 2) to (4, 6) is 5 units.
8.GM.C.9
Solve problems with the surface area of pyramids and the volume of pyramids, cones and spheres, explaining what each measure means, like how much an ice cream cone holds.

Data Analysis, Statistics and Probability

4 standards
8.DSP.A.1
Make and interpret scatter plots of paired measurements to look for patterns, like whether taller students tend to have longer arm spans.
8.DSP.A.2
Draw a trend line on a scatter plot, use it to make predictions, and judge informally how well it fits the points.
8.DSP.A.3
Explain what the slope and intercept of a linear model mean for real paired data and use them to solve problems, like 2.5 cm of growth per week.
8.DSP.A.4
Make and read two-way tables of categorical data from the same group and use row or column percents to spot links, like curfew and chores.

Functions

5 standards
8.F.A.1
Explain that a function gives exactly one output for each input, decide whether a relation is a function, and graph functions, without needing function notation.
8.F.A.2
Compare features of two functions shown in different ways, like a table versus an equation, to see which grows faster or starts higher.
8.F.A.3
Tell linear from nonlinear functions, read y = mx + b as a line with constant slope m and y-intercept b, and give nonlinear examples like y = x².
8.F.B.4
Model a linear relationship with a function, find and explain its slope, y-intercept and x-intercept in context, like a phone plan of $20 plus $5 per gigabyte.
8.F.B.5
Describe how one quantity depends on another from a graph or a written description, like where a graph rises, falls or levels off.

The official Missouri documents

The plain-English lines on this page are EMStudio's own explanations of Missouri's standards, not the official wording, which Missouri Department of Elementary and Secondary Education publishes in the documents above. Codes and strand names identify each standard.