Texas TEKS 8.2.C

Science8th GradeScientific and engineering practices

The Standard

use mathematical calculations to assess quantitative relationships in data

Texas Essential Knowledge and Skills for Science

Teacher's field guide

What Students Need to Do: Students calculate ratios, rates, percentages, averages, or changes from measurements. They use the results to compare variables and explain patterns in the data.
What Mastery Looks Like: Given a table or graph, students choose the right calculation, show their work, and include units. They describe the relationship and support it with calculated values.
Common Misconceptions: Students may compare raw totals when a rate or percentage is needed, compare values with different units, or omit units. They may also claim causation from a pattern or describe a graph without calculated evidence.
How to Assess It: Use this exit ticket: Plant A grew 4 cm in 8 days, and Plant B grew 9 cm in 12 days. Calculate each growth rate and compare them.

Lesson moves

Have groups measure water temperature every two minutes, calculate cooling rates, and compare results for covered and uncovered cups.
Ask students to write a claim about two data sets and support it with one calculated comparison.
Run a card sort matching data tables with the correct calculation, numerical result, and evidence-based conclusion.
Give students grocery ads and have them calculate unit prices to determine which package offers the better value.

Free download

A ready-to-print activity worksheet aligned to 8.2.C, with an answer key for the teacher on its own page. No account needed.

PDF, US Letter, prints cleanly in black and white.

Keep exploring

Grade, subject, topic, and the complete standard are prefilled. Create one free, no account needed.