| 401. | Subject-verb agreement | Syntax | Khan Academy | 3,672 | |
|
| 402. | Product rule | Taking derivatives | Differential Calculus | Khan Academy | 3,658 | |
|
| 403. | Overview of cell signaling | 3,655 | |
|
| 404. | Subtracting fractions with unlike denominators | 3,654 | |
|
| 405. | Meet the preposition | The parts of speech | Grammar | Khan Academy | 3,653 | |
|
| 406. | Permutations | 3,644 | |
|
| 407. | Overview of the Middle Ages | World History | Khan Academy | 3,626 | |
|
| 408. | Total internal reflection | Geometric optics | Physics | Khan Academy | 3,621 | |
|
| 409. | National SAT Practice Test Day | 3,611 | |
|
| 410. | How Khan Academy is Here to Help During COVID-19 | 3,592 | |
|
| 411. | Contour plots | Multivariable calculus | Khan Academy | 3,591 | |
|
| 412. | Introduction to singular and plural nouns | Grammar | Khan Academy | 3,580 | |
|
| 413. | Compound interest introduction | Interest and debt | Finance & Capital Markets | Khan Academy | 3,577 | |
|
| 414. | Statistics: Variance of a population | Probability and Statistics | Khan Academy | 3,565 | |
|
| 415. | Introduction to Balance Sheets | Housing | Finance & Capital Markets | Khan Academy | 3,565 | |
|
| 416. | Conservation of energy | Work and energy | Physics | Khan Academy | 3,565 | |
|
| 417. | Introduction to combinations | Probability and Statistics | Khan Academy | 3,557 | |
|
| 418. | Lipid overview | Macromolecules | Biology | Khan Academy | 3,557 | Vlog |
|
| 419. | Oxidative phosphorylation and the electron transport chain | Khan Academy | 3,554 | |
|
| 420. | Zoroastrianism | World History | Khan Academy | 3,552 | |
|
| 421. | Introduction to frames of reference | 3,545 | |
|
| 422. | Simple and compound sentences | Syntax | Khan Academy | 3,544 | |
|
| 423. | Arteries vs. veins-what's the difference? | Circulatory system physiology | NCLEX-RN | Khan Academy | 3,542 | Vlog |
|
| 424. | Commodity money vs. Fiat money | Financial sector | AP Macroeconomics | Khan Academy | 3,534 | |
|
| 425. | R-squared or coefficient of determination | Regression | Probability and Statistics | Khan Academy | 3,534 | |
|
| 426. | Cylinder volume and surface area | Perimeter, area, and volume | Geometry | Khan Academy | 3,531 | |
|
| 427. | Separable differential equations introduction | First order differential equations | Khan Academy | 3,530 | |
|
| 428. | Similar triangles | Similarity | Geometry | Khan Academy | 3,526 | |
|
| 429. | Glucose Insulin and Diabetes | 3,517 | |
|
| 430. | Molecular and Empirical Formulas | 3,516 | |
|
| 431. | LearnStorm Growth Mindset: How to write a SMART goal | 3,511 | Guide |
|
| 432. | cis-trans and E-Z naming scheme for alkenes | Alkenes and Alkynes | Organic chemistry | Khan Academy | 3,509 | |
|
| 433. | Common and proper nouns | The parts of speech | Grammar | Khan Academy | 3,505 | |
|
| 434. | Pi bonds and sp2 hybridized orbitals | Structure and bonding | Organic chemistry | Khan Academy | 3,504 | |
|
| 435. | Newton's second law of motion | Forces and Newton's laws of motion | Physics | Khan Academy | 3,488 | |
|
| 436. | Using Trig Functions | 3,487 | |
|
| 437. | Statistics: Sample variance | Descriptive statistics | Probability and Statistics | Khan Academy | 3,484 | |
|
| 438. | Basic leveraged buyout (LBO) | Stocks and bonds | Finance & Capital Markets | Khan Academy | 3,481 | |
|
| 439. | Mortgage-backed securities I | Finance & Capital Markets | Khan Academy | 3,475 | |
|
| 440. | Perfect competition | Microeconomics | Khan Academy | 3,472 | |
|
| 441. | Types of decay | Nuclear chemistry | Chemistry | Khan Academy | 3,468 | |
|
| 442. | Basic fractional exponents | Exponent expressions and equations | Algebra I | Khan Academy | 3,466 | |
|
| 443. | Converting from decimal to binary | Applying mathematical reasoning | Pre-Algebra | Khan Academy | 3,450 | |
|
| 444. | Vietnam War | The 20th century | World history | Khan Academy | 3,450 | |
|
| 445. | Polymerase chain reaction (PCR) | Biomolecules | MCAT | Khan Academy | 3,449 | |
|
| 446. | Introduction to buffers | Water, acids, and bases | Biology | Khan Academy | 3,445 | Vlog |
|
| 447. | Trp operon | 3,437 | |
|
| 448. | Sampling distribution of the sample mean | Probability and Statistics | Khan Academy | 3,436 | |
|
| 449. | Summarizing stories | Reading | Khan Academy | 3,435 | |
|
| 450. | Dividing decimals completely | Arithmetic operations | 5th grade | Khan Academy | 3,422 | |
|
| 451. | Help Khan Academy supercharge learning | 3,413 | Let's Play |
|
| 452. | Introduction to Programs Data Types and Variables | 3,404 | |
|
| 453. | Recognizing odd and even functions | Functions and their graphs | Algebra II | Khan Academy | 3,402 | |
|
| 454. | Spread of Islamic Culture | World History | Khan Academy | 3,400 | |
|
| 455. | Sal's back to school 2021 message | 3,389 | |
|
| 456. | Explicit and recursive definitions of sequences | Precalculus | Khan Academy | 3,387 | |
|
| 457. | Solving a quadratic equation by factoring | Algebra II | Khan Academy | 3,379 | |
|
| 458. | Greatest common factor explained | Factors and multiples | Pre-Algebra | Khan Academy | 3,377 | |
|
| 459. | Cell theory | Structure of a cell | Biology | Khan Academy | 3,376 | Vlog |
|
| 460. | US History Overview 1: Jamestown to the Civil War | 3,374 | |
|
| 461. | Ionization energy trends | Periodic table | Chemistry | Khan Academy | 3,373 | |
|
| 462. | Dangling modifiers | Syntax | Khan Academy | 3,372 | |
|
| 463. | Complex Numbers (part 1) | 3,370 | |
|
| 464. | Introduction to gravity | Centripetal force and gravitation | Physics | Khan Academy | 3,369 | |
|
| 465. | Comparing E2 E1 Sn2 Sn1 Reactions | 3,367 | |
|
| 466. | Overview of the Bolshevik Revolution | 3,364 | |
|
| 467. | Electric potential energy | Electrostatics | Electrical engineering | Khan Academy | 3,360 | |
|
| 468. | Poisson process 1 | Probability and Statistics | Khan Academy | 3,357 | |
|
| 469. | Antiderivatives and indefinite integrals | AP Calculus AB | Khan Academy | 3,353 | |
|
| 470. | Recognizing fragments | Syntax | Khan Academy | 3,338 | |
|
| 471. | 2nd order linear homogeneous differential equations 1 | Khan Academy | 3,338 | |
|
| 472. | Thermal conduction, convection, and radiation | Thermodynamics | Physics | Khan Academy | 3,334 | |
|
| 473. | Electrophilic aromatic substitution | Aromatic Compounds | Organic chemistry | Khan Academy | 3,326 | |
|
| 474. | Probability with playing cards and Venn diagrams | Probability and Statistics | Khan Academy | 3,322 | |
|
| 475. | LM part of the IS-LM model | Macroeconomics | Khan Academy | 3,321 | |
|
| 476. | Common and systematic naming: iso-, sec-, and tert- prefixes | Organic chemistry | Khan Academy | 3,320 | |
|
| 477. | Sodium-potassium pump | Cells | MCAT | Khan Academy | 3,307 | |
|
| 478. | Scientific notation examples | Pre-Algebra | Khan Academy | 3,305 | |
|
| 479. | Visual introduction to parabolas | 3,300 | |
|
| 480. | Introduction to number systems and binary | Pre-Algebra | Khan Academy | 3,299 | |
|
| 481. | Partial fraction expansion 1 | Partial fraction expansion | Precalculus | Khan Academy | 3,299 | |
|
| 482. | Prokaryotic and eukaryotic cells | Biology | Khan Academy | 3,289 | Vlog |
|
| 483. | Introduction to reaction mechanisms | Alkenes and Alkynes | Organic chemistry | Khan Academy | 3,287 | |
|
| 484. | History of the Democratic Party | American civics | US government and civics | Khan Academy | 3,277 | |
|
| 485. | Chi-square distribution introduction | Probability and Statistics | Khan Academy | 3,274 | |
|
| 486. | Price elasticity of demand using the midpoint method | Elasticity | Microeconomics | Khan Academy | 3,259 | |
|
| 487. | Chain Rule Examples | 3,259 | |
|
| 488. | History of the Republican Party | American civics | US government and civics | Khan Academy | 3,259 | |
|
| 489. | Matrix multiplication (part 2) | 3,256 | |
|
| 490. | Discriminant of quadratic equations | Polynomial and rational functions | Algebra II | Khan Academy | 3,247 | |
|
| 491. | Dashes | Punctuation | Khan Academy | 3,235 | |
|
| 492. | Using context clues to figure out new words | Reading | Khan Academy | 3,234 | |
|
| 493. | Initial rise of Hitler and the Nazis | The 20th century | World history | Khan Academy | 3,213 | |
|
| 494. | Compound probability of independent events | Probability and Statistics | Khan Academy | 3,211 | |
|
| 495. | Angles formed by parallel lines and transversals | Geometry | Khan Academy | 3,205 | |
|
| 496. | Current | Introduction to electrical engineering | Electrical engineering | Khan Academy | 3,201 | |
|
| 497. | Domain and range of a function | Functions and their graphs | Algebra II | Khan Academy | 3,200 | |
|
| 498. | Alleles and genes | 3,197 | |
|
| 499. | Logarithmic scale | Logarithms | Algebra II | Khan Academy | 3,191 | Vlog |
|
| 500. | Transpose of a matrix | Matrices | Precalculus | Khan Academy | 3,190 | |
|
