Master the quadratic formula x = (-b ± √(b²-4ac)) / 2a with our interactive step-by-step solver, worked examples (rational, radicals, complex), and free 1-page printable cheat sheet.

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Algebra•4 min

The Discriminant Explained

Master the quadratic discriminant Δ = b² - 4ac with our interactive visualizer, step-by-step worked examples, 3 root cases, and free 1-page printable cheat sheet.

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Algebra•4 min

What is a Quadratic Equation?

Learn what makes an equation quadratic.

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Algebra•6 min

Factoring Quadratic Equations (ac-Method & X-Factor)

Master factoring quadratic equations step by step.

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Algebra•6 min

Solving Linear Equations (1-Step, 2-Step & Multi-Step)

Master solving 1-step, 2-step, and multi-step linear equations step by step.

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Algebra•6 min

Slope-Intercept Form (y = mx + b) & Graphing Lines

Master slope-intercept form (y = mx + b) and linear equations step by step.

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Algebra•6 min

Polynomial Operations

Learn to add, subtract, and multiply polynomials.

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Fractions•3 min

What is a Mixed Number?

Learn what mixed numbers are and how they combine whole numbers with fractions.

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Fractions•4 min

Mixed to Improper Fraction

Learn the easy method to convert mixed numbers to improper fractions.

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Fractions•4 min

Improper to Mixed Number

Learn to convert improper fractions to mixed numbers using division.

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Fractions•5 min

Adding Mixed Numbers

Learn to add mixed numbers with same and different denominators.

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Fractions•5 min

Subtracting Mixed Numbers

Learn to subtract mixed numbers including borrowing.

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Fractions•5 min

Multiply & Divide Mixed Numbers

Learn the simple method to multiply and divide mixed numbers by converting to improper fractions first.

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Fractions•6 min

Adding Fractions with Unlike Denominators

Master adding fractions with unlike denominators using the Least Common Denominator (LCD/LCM) and Butterfly methods.

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Fractions•6 min

Subtracting Fractions with Unlike Denominators

Master subtracting fractions with different denominators using the Least Common Denominator (LCD/LCM) and Butterfly methods.

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Fractions•6 min

Multiplying & Dividing Fractions

Master multiplying and dividing fractions with the Area Model, Cross-Canceling, and the Keep-Change-Flip (KCF) reciprocal method.

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Fractions•6 min

Mixed Numbers & Improper Fractions

Master converting between improper fractions and mixed numbers using division with remainder and the Clockwise MAD method.

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Fractions•6 min

Fractions, Decimals & Percents (The Conversion Triangle)

Master converting between fractions, decimals, and percentages with the Rosetta Stone Conversion Triangle.

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Fractions•5 min

Repeating Decimals to Fractions

Learn the algebraic method to convert repeating decimals like 0.

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Arithmetic•6 min

Long Multiplication Step-by-Step (2-Digit & 3-Digit)

Master multi-digit long multiplication step by step with the standard vertical algorithm, Area/Box model, placeholder zero warnings, 6 interactive visual scaffolds, and free 1-page printable cheat sheet.

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Arithmetic•6 min

Long Division Step-by-Step (with Remainders & 2-Digit)

Master long division step by step with the DMSB (Dad Mom Sister Brother) family method, 6 interactive visual bracket scaffolds, zero quotient traps, and free 1-page printable cheat sheet.

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Arithmetic•5 min

Order of Operations (PEMDAS / BODMAS)

Master the order of operations with our interactive step-by-step expression solver, PEMDAS vs BODMAS breakdown, common trap warnings, and free 1-page printable cheat sheet.

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Arithmetic•5 min

Adding and Subtracting Integers (Negative Numbers)

Master adding and subtracting negative numbers with our interactive Hot Air Balloon simulator, 3 Golden Rules, common trap warnings, and free 1-page printable cheat sheet.

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Arithmetic•6 min