Big Ideas Math, Course 3

Frequently Asked Questions

Is Big Ideas Math Course 3 the right textbook for my 8th grader?

Big Ideas Math Course 3 is a widely used, Common Core-aligned 8th-grade math textbook that covers the full range of content expected before Algebra 1 or Algebra 1 itself: equations, transformations, the Pythagorean theorem, linear functions, systems of equations, exponents, and data analysis. It is appropriate for students at standard grade-level pacing and is used in many public school districts nationwide. If your child is on the standard track, this textbook covers exactly what they need to be ready for high school math.

Which chapters in Big Ideas Math Course 3 are the hardest for 8th graders?

Chapter 4 on graphing linear equations and Chapter 5 on systems of linear equations are where many students struggle — slope-intercept form, writing equations from graphs, and solving systems by graphing, substitution, and elimination all arrive in rapid succession. Chapter 7 on the Pythagorean theorem requires understanding square roots and irrational numbers, which Chapter 6 on real numbers introduces just before. Students with shaky equation-solving skills from Chapter 1 also find later chapters disproportionately hard.

My child is weak in linear equations and slope — where should they start?

Make sure Chapter 1 is solid first — especially Lesson 1 (solving simple equations) and Lesson 3 (variables on both sides). Then work through Chapter 4 lesson by lesson: Lesson 1 introduces linear equations by graphing, Lesson 2 covers slope as rise over run, and Lessons 3–4 develop slope-intercept and point-slope forms. Many students struggle with slope not because it is hard, but because they rush into the formula without a solid picture of what slope means visually on a graph.

What does my child study after Big Ideas Math Course 3?

Students who complete Course 3 on track typically move to Algebra 1 or a combined Algebra 1/Geometry course in 9th grade. The linear equations, systems, functions, and exponents covered in Course 3 are the direct foundations of high school Algebra 1 and Algebra 2. Big Ideas Learning also publishes the Algebra 1 and Geometry textbooks that follow in this sequence, so the notation and problem-solving structure will already be familiar to your child.

How can Pengi help my child with Big Ideas Math Course 3?

Pengi can walk through any lesson from Big Ideas Math Course 3 step-by-step. If your child cannot figure out why a system of equations has infinitely many solutions (Chapter 5), or is confused about how dilations differ from other transformations (Chapter 2, Lesson 7), Pengi explains it at exactly the right level and then asks questions to check understanding. Pengi is also great for exam prep — your child can describe which chapter they are being tested on and Pengi will generate targeted practice problems and catch common mistakes.