6th grade mathematics
(additional middle school math courses can be found here)
Craving an old-school textbook? This free Common Core Course 1 textbook (choose program "California") aligns nicely with 6th grade (just notice the units are out of order). This text also has practice quizzes, chapter reviews, chapter tests, and study help.
What to know more details about what topics are covered in each unit? Check out the Georgia Department of Education curriculum map.
Calculators
Four Function (Desmos)
Scientific Calculator (Desmos Scientific)
Graphing Calculator (Desmos Graphing)
Extra Practice
Open Up Resources Nonprofit - my favorite free resource for practice and explanations, best alignment with 6th grade standards and many materials (see also Illustrative Mathematics - same content different platform)
KutaSoftware - free simple worksheets with answers, content doesn't align perfectly with 6th grade math so you have to dig through "preAlgebra" to find what you want
GMAS Test Prep - 6th Grade Math workbook (Amazon) - not amazing, not horrible. It's clear the publisher grabbed a bunch of pre-algebra and statistics test-prep problems that were decently aligned with Georgia's 6th grade standards. There are definitely some questions that should be excluded as they include content not covered in prior to or during 6th grade
This website is a labor of love for the students at DT Howard Middle School (and a work in progress).