Rational and irrational numbers
Students learn that some numbers, like the square root of 2 or pi, cannot be written as simple fractions. They place these numbers on a number line and compare their sizes.
This is the year math stops being about whole numbers and starts being about lines, slopes, and the relationships between them. Students work with negative exponents, square roots, and very large or very small numbers written in scientific notation. They learn to graph straight lines, solve equations with a variable on both sides, and figure out where two lines cross. By spring, students can look at a real-world situation, write an equation for it, and graph the line that matches.
Students learn that some numbers, like the square root of 2 or pi, cannot be written as simple fractions. They place these numbers on a number line and compare their sizes.
Students work with very large and very small numbers using powers of ten. They write distances in space or sizes of cells in a shorter form and do basic math with them.
Students solve equations with a variable on both sides and study lines on a graph. They learn what slope means as a steady rate of change, like miles per hour or dollars per week.
Students solve two equations at once to answer questions with two unknowns, like figuring out the price of a sandwich and a drink when given two combo totals.
Students study how one quantity depends on another, like how far a car goes based on time. They read these relationships from tables, graphs, and short rules.
Students use the Pythagorean theorem to find missing side lengths of right triangles and distances on a map. They also work with transformations, angles, and the volume of cones, cylinders, and spheres.
Students read a math problem carefully, figure out what it's actually asking, and keep trying even when the first approach doesn't work.
Students take a real problem, strip it down to numbers and symbols to solve it, then translate the answer back into what it actually means in context.
Students back up their math answers with reasons, then listen to classmates' thinking and explain where they agree or disagree.
Students take a real-world situation, like splitting a bill or figuring out how long a trip takes, and write an equation or draw a diagram to make sense of it.
Students choose the right tool for the job, whether that means grabbing a calculator, sketching by hand, or making a quick estimate. The goal is knowing when each approach helps and when it gets in the way.
Students use the right math words and label answers with the correct units, like inches or dollars. They check their calculations carefully so small errors don't lead to wrong answers.
Students learn to spot patterns and hidden structure in math problems, like noticing that a shape or equation follows a rule they already know. That shortcut helps them solve new problems faster.
When a calculation keeps working the same way, students notice the pattern and write a rule for it instead of repeating the same steps every time.
| Standard | Definition | Code |
|---|---|---|
| Make Sense of Problems | Students read a math problem carefully, figure out what it's actually asking, and keep trying even when the first approach doesn't work. | DC-MATH.MP.8.1 |
| Reason Abstractly | Students take a real problem, strip it down to numbers and symbols to solve it, then translate the answer back into what it actually means in context. | DC-MATH.MP.8.2 |
| Construct Arguments | Students back up their math answers with reasons, then listen to classmates' thinking and explain where they agree or disagree. | DC-MATH.MP.8.3 |
| Model with Mathematics | Students take a real-world situation, like splitting a bill or figuring out how long a trip takes, and write an equation or draw a diagram to make sense of it. | DC-MATH.MP.8.4 |
| Use Tools Strategically | Students choose the right tool for the job, whether that means grabbing a calculator, sketching by hand, or making a quick estimate. The goal is knowing when each approach helps and when it gets in the way. | DC-MATH.MP.8.5 |
| Attend to Precision | Students use the right math words and label answers with the correct units, like inches or dollars. They check their calculations carefully so small errors don't lead to wrong answers. | DC-MATH.MP.8.6 |
| Use Structure | Students learn to spot patterns and hidden structure in math problems, like noticing that a shape or equation follows a rule they already know. That shortcut helps them solve new problems faster. | DC-MATH.MP.8.7 |
| Express Regularity | When a calculation keeps working the same way, students notice the pattern and write a rule for it instead of repeating the same steps every time. | DC-MATH.MP.8.8 |
Grade 8 students work with whole numbers, fractions, and negative numbers to solve problems. They use what they know about how numbers relate to each other, including place value and rational number rules, to reason through math at this level.
Students use addition, subtraction, multiplication, and division to write expressions and solve problems. At this grade, that work involves variables, exponents, and equations with multiple steps.
Students read and build tables, graphs, and basic statistical summaries to make sense of real data. They use those tools to spot patterns and draw conclusions.
Students describe, sort, and measure flat and solid shapes, finding angles, side lengths, area, and volume to solve problems.
Students use ratios and proportions to solve everyday problems, like figuring out unit prices, scaling a recipe, or comparing speeds. The math connects numbers to real situations they'll actually encounter.
| Standard | Definition | Code |
|---|---|---|
| Counting and Number | Grade 8 students work with whole numbers, fractions, and negative numbers to solve problems. They use what they know about how numbers relate to each other, including place value and rational number rules, to reason through math at this level. | DC-MATH.K8.8.1 |
| Operations and Algebraic Thinking | Students use addition, subtraction, multiplication, and division to write expressions and solve problems. At this grade, that work involves variables, exponents, and equations with multiple steps. | DC-MATH.K8.8.2 |
| Measurement and Data | Students read and build tables, graphs, and basic statistical summaries to make sense of real data. They use those tools to spot patterns and draw conclusions. | DC-MATH.K8.8.3 |
| Geometry | Students describe, sort, and measure flat and solid shapes, finding angles, side lengths, area, and volume to solve problems. | DC-MATH.K8.8.4 |
| Ratios and Proportional Relationships | Students use ratios and proportions to solve everyday problems, like figuring out unit prices, scaling a recipe, or comparing speeds. The math connects numbers to real situations they'll actually encounter. | DC-MATH.K8.8.5 |
DC's spring summative math test for grades 3 through 8, aligned to DC's Common Core-based math standards.
Alternate assessment for students with the most significant cognitive disabilities, given in grades 3-8 and high school in ELA, math, and science.
Federally administered sample-based assessment in reading, mathematics, science, and writing. NAEP results inform state-by-state comparisons rather than individual student or school accountability.