Khan Academy Exercises and Videos

Using the quotient rule, 2016 Calculus AB free response 6b

2026-09-23T16:30:46.955001

Demonstrate how to apply the quotient rule to find the first derivative of a function. All the values necessary to find the value of the derivative are found in the table that is given in the stem, 2016 Calculus AB free response 6b.

Examples of Line Graphs

2026-09-22T08:00:45.055299

In this video, we will learn how to represent and interpret data using line graphs. Through examples and practice questions, you will develop the skills needed to read and construct line graphs with confidence.

Doubling and Halving a Square

2026-09-22T08:00:45.055299

Explore Baudhayana’s method of doubling and halving a square through simple visual constructions and hands-on paper activities. Learn how a square’s diagonal can create a square with double the area and how to construct a square with half the area. Understand the geometry behind these constructions using visual reasoning and triangle congruence.

Representation of Solids on a Plane Surface

2026-09-22T08:00:45.055299

Learn how to visualise and draw projections of different 2D and 3D objects, from a point and line to squares, cubes, polygons, and cones. Understand how top, front, and side views help us represent 3D objects on a 2D surface. Build your spatial visualisation skills by exploring projections step-by-step.

Visualize Pythagoras Theorem

2026-09-22T07:30:47.621944

Discover the Pythagorean Theorem through Baudhayana’s ancient mathematical statement, engaging visualisations, and a simple paper-cut activity. We will understand the theorem intuitively and then see how it is established through a mathematical proof.

Creating a relative frequency table for one categorical variable

2026-09-21T12:30:46.766292

Sal shows how to turn counts for a single categorical variable into proportions in a relative frequency table.

Identifying a census

2026-09-21T12:30:46.766292

Sal shows how to decide whether a described data collection method is a census, by naming the population and checking that every individual in it was recorded.

Sampling with and without replacement

2026-09-21T12:30:46.766292

Sal shows how to classify a described sampling procedure as with or without replacement.

Classifying discrete and continuous variables

2026-09-21T12:30:46.766292

Sal shows how to classify a quantitative variable as discrete or continuous, and give the reason for the classification.

Find numbers in workplace documents

2026-09-18T10:41:08.406972

Identify the numbers found in common workplace papers such as job orders, time sheets, and sari-sari store price lists, and point to where each number sits on the page.

Select only the data you need

2026-09-18T10:41:08.406972

Examine a document or chart that holds extra numbers and select only the relevant data needed to complete the task at hand.

Interpret charts, tables, and diagrams

2026-09-18T10:41:08.406972

Interpret visual information in a simple chart, table, or diagram, such as a price table in a sari-sari store or a labeled diagram of safety gear, and describe what one row, column, or label means in plain words.

Organizing and relating numbers

2026-09-18T10:41:08.406972

Organize numerical information from a structured source into a clear order and detect the simple relationships between the numbers, such as which item sold most across a week.

Naming measurement units and tools

2026-09-18T10:41:08.406972

Name the standard units for length, weight, volume, and time, and recall which measuring tool matches each one in a Filipino trade setting.

What Was the Cold War?

2026-09-12T15:20:48.895265

The Cold War started with singing and dancing, as American and Soviet troops met in Germany at the end of the Second World War. But the leaders of the two new superpowers soon sent the world back into global conflict. While they avoided direct war with each other and--just barely--avoided nuclear catastrophe, the US and USSR waged proxy wars against each other in Asia, Africa, and Latin America. Why did the US and its allies triumph in 1991? Let your students decide for themselves. 01:20 What events marked the beginning of the Cold War? 02:05 What was the policy of containment and where did this policy originate? 03:04 What alliance systems were created during the Cold War? 06:57 What tools did the US and Soviet Union use to try to win the Cold War? 09:11 How did the US eventually win the Cold War?

The Year Without a Summer

2026-09-12T15:00:37.451498

Use our Mt. Tambora activity to help students map global impacts, analyze cause and effect, and explore how climate events can reshape human history. How did a single volcanic eruption cause a global food crisis? After Mount Tambora erupted in 1815, ash and gases spread through the atmosphere and helped trigger the global cooling event known as “The Year Without a Summer.” Discover how this disaster connected climate, agriculture, migration, and human history across the globe. Guiding questions: 00:45 What caused “The Year Without a Summer” in 1816? 03:57 How did the weather of 1816 shift after Mount Tambora’s eruption? 06:01 How did Mount Tambora’s eruption impact human systems around the world?

How a Wrong Turn Started World War I

2026-09-12T15:00:37.451498

The assassination of Archduke Franz Ferdinand launched the First World War. But what if the assassin's bullet had missed? Well, it turns out, it did…a few different times. The Archduke just couldn't get it right as he repeatedly put himself in harm's way and gave the assassins more chances than they deserved. If he had escaped, would the war still have happened? You decide. Guiding questions: 01:12 What is the Balkans and why was it important in the nineteenth century? 01:58 Who was Gavrilo Princip and what did he want? 04:00 What were the fateful mistakes that the Archduke and his staff made that ended in his assassination? 04:43 How did the killing of the Archduke lead to World War I? 06:45 What were some other causes of World War I other than the assassination?

Exploring the Grand Challenges

2026-09-12T15:00:37.451498

Why do we release so many greenhouse gases? Explore the Grand Challenges—the main areas responsible for emissions—to understand the problem of decarbonization, and what we can actually do about it. Guiding Questions 01:15 What is decarbonization, and why is it challenging? 03:03 What are the five Grand Challenges? 03:39 Why are the Grand Challenge categories imperfect? 04:26 How can understanding the Grand Challenges be helpful?

The Sahara Desert Used to be....Green?!

2026-09-12T15:00:37.451498

Help students think about the impacts of climate change by examining a surprising development—the Sahara Desert was once, well, not a desert! Guiding Questions: 01:10 What are the different features of the Sahara Desert today? 02:05 What do ancient petroglyphs and fossils tell us about the climate and landscape of the Sahara region before it became a desert? 03:26 How long of a period was the Sahara region greener and wetter than today? 05:17 How might an increase in pastoralism have caused the climate of the Sahara region to become drier? 06:36 Where did many early humans migrate around 7,000 to 5,000 years ago after the Sahara became a desert?

Japan's Home Run: The Meiji Restoration

2026-09-12T15:00:37.451498

The Meiji Restoration shows students what modernization actually looked like in real time. As Japan opened to foreign trade and ideas, leaders worked to build a stronger state without abandoning Japanese identity. This video explores how treaties, industrialization, imperial pressure, and cultural adaptation reshaped Japan — and helped turn it into a global power. Guiding Questions 01:36 What started the Meiji Restoration? 02:20 What was the goal of the Meiji Restoration, and what were some ways Japan’s leaders wanted to accomplish this goal? 03:38 How did baseball become part of the Meiji Restoration? 06:30 What role did Ichiko school play in the story of baseball’s rise in Japan? 07:50 Why was the Russo-Japanese War important? How was it connected to baseball? Stay Connected: Join the conversation on our community forum: https://oer-prj.com/community Follow us on social: https://www.instagram.com/oerproject/ https://www.facebook.com/OERProject/ About OER Project: OER Project supports social studies teachers with free, high-quality curriculum, primary sources, and teaching tools.

Geolocation

2026-09-23T21:51:16.000000

Check your understanding of how a user's geolocation can be tracked in this set of free practice questions designed for AP Computer Science Principles students.

Transport Layer Security (TLS)

2026-09-23T21:50:23.000000

Check your understanding of Transport Layer Security (TLS) / Secure Sockets Layer (SSL), in this set of free practice questions designed for AP Computer Science Principles students.

Circumference of a circle

2026-09-23T16:41:32.000000

Find the circumference of a circle when given either the radius or diameter. Find the radius or diameter of a circle when given the circumference.

Unit rates

2026-09-23T16:31:09.000000

Find the unit rate for two quantities. For example, if you spend 70 dollars on 8 movie tickets, how much does one movie ticket cost?

Interquartile range (IQR)

2026-09-23T15:18:31.000000

Practice finding the interquartile range (IQR) of a data set.

Apply: Earth's major systems

2026-09-23T14:25:09.000000

Apply your understanding of Earth's major systems in this set of free, standards-aligned practice questions.

GCF & LCM word problems

2026-09-23T14:04:53.000000

Solve word problems where you either need to find the GCF or LCM.

Number opposites

2026-09-23T14:04:13.000000

Practice finding the opposites of numbers. Numbers are opposites when they're on opposite sides of the number line the same distance from zero.

Identify geometric solids (3D shapes)

2026-09-23T14:02:43.000000

Identify prisms, pyramids, cylinders, cones, and spheres.

Adding negative numbers on the number line

2026-09-23T13:27:03.000000

Practice matching number line diagrams to addition expressions involving negative numbers.

Comparing distributions

2026-09-23T13:10:16.000000

Practice comparing distributions that are presented in dot plots, histograms, and box plots.

Writing fractions as repeating decimals

2026-09-22T23:23:03.000000

Practice writing fractions as repeating decimals. Get ready to bust out those long division skills!

Converting repeating decimals to fractions

2026-09-22T23:13:56.000000

Practice converting 1- and 2-digit repeating decimals to fractions.

Cube roots

2026-09-22T23:08:57.000000

Practice finding the cube root of a perfect cube positive integer.

Function domain word problems

2026-09-22T22:00:42.000000

Use information about a situation to figure out the domain of the function which models it.

Making appropriate scatter plots

2026-09-22T20:49:10.000000

An appropriate scatter plot has the independent variable on the x-axis and the dependent variable on the y-axis. Also, the scale of both axes should be reasonable, making the data as easy to read as possible. In these practice problems, we practice telling good scatter plots from bad ones.

Use arithmetic sequence formulas

2026-09-22T20:43:47.000000

Given the formula of an arithmetic sequence, either in explicit form or in recursive form, find a specific term in the sequence.

Factor quadratics by grouping

2026-09-22T20:39:29.000000

Factor quadratics of the form ax²+bx+c.

Compare decimal place value

2026-09-22T19:25:44.000000

Compare 2 numbers to thousandths based on meanings of the digits in each place.

Simplify complex fractions

2026-09-22T18:33:30.000000

Practice simplifying complex fractions.