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Find a missing side with the Pythagorean theorem

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Locked: part of the monthly and yearly plans. Plans open soon.

Captions are on by default. AI narration: Qwen3-TTS, Sohee (English). Sources & media credits

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13 free videos
FREE · Math

Solve a word problem in 4 steps

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FREE · Math

Get comfortable with the test calculator

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FREE · Reading and Writing (RLA)

Plan your essay in 5 minutes

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FREE · Reading and Writing (RLA)

Find the main idea and the details that prove it

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FREE · Social Studies

Supply, demand and price

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FREE · Science

Punnett squares: the chance of a trait

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FREE · Math

Find a sale price, step by step

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FREE · Math

See fractions on a number line

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FREE · Math

Compare prices for one unit

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FREE · Science

Read a graph: axes, scale and units

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FREE · Reading and Writing (RLA)

Which evidence supports the claim?

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FREE · Social Studies

Read a historical source in context

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FREE · Math

Mean, median and one unusual value

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Looking for more practice? 4 member videos

Extra practice is available with a membership. Every free lesson stays open without joining.

Experiments: what you change and what you measureMember extra ↗Three branches and checks and balancesMember extra ↗Find a missing side with the Pythagorean theoremMember extra ↗Pythagorean practice: 3 harder problemsMember extra ↗

Original FinishHigh explanations and examples. Independent GED® test-style practice, with no pass guarantee. AI narration is identified beside each player. Sources & media credits ↗