Spot the error, step by step

Someone has worked a question out and got it wrong.

The question

Priya wrote 24 − 6 = 28. Write the correct answer.

Priya wrote 24 − 6 = 28. Write the correct answer.

Priya wrote 24 − 6 = 28. Write the correct answer.
246=18
246=18
they wrote:28
  1. Do not check by reading their working. Somebody else's answer is the most persuasive thing on the page, and rereading it is how you end up agreeing with it — work the sum yourself first, then compare.
  2. On your own: 24 − 6 = 18.
  3. Now compare. They wrote 28, and it should be 18 — out by 10. The correct answer is 18.

How it works.

  1. 01

    Do not check by reading their working. Somebody else's answer is the most persuasive thing on the page, and rereading it is how you end up agreeing with it — work the sum yourself first, then compare.

  2. 02

    On your own: 24 − 6 = 18.

  3. 03

    Now compare. They wrote 28, and it should be 18 — out by 10. The correct answer is 18.