Errata: learn by finding the mistake

Errata is a study and revision web app that turns your study materials into source-grounded exercises with deliberate mistakes. Find and correct them, then learn from feedback based on your sources.

Maths · Number1 mistake

Question

Work out −3 × −4 and explain your answer. [2 marks]

Answer

This answer contains deliberate mistakes. Find and correct them.Review the corrections and their source evidence.

When you multiply two negative numbers together, the answer is negativeReplace with…↵✓ Correctpositive. So −3 × −4 = 12.

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All mistakes corrected1 / 1 corrected

✓positiveCorrected

Multiplying two negative numbers always gives a positive answer, so −3 × −4 = 12.

negative-numbers.pdf · page 2 ↗

Continue1 wrong click

Find the mistake. Correct it. Learn from it.

A demonstration of an Errata exercise: the cursor first picks a phrase that is already correct, which shakes and costs an attempt. It then finds the deliberate mistake, types a correction, sees that it is correct, and reviews the explanation from the study material before continuing.

Errata: learn by finding the mistake

Find the mistake. Correct it. Learn from it.Find the mistake.Correct it.Learn from it.

Find the mistake. Correct it. Learn from it.