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Why multitasking causes mistakes — Psychology, 11–13 years

Your attention does not truly do several demanding jobs at once: it keeps switching between them. Understanding that switch helps you plan homework, messages and activities more wisely.

Attention switches

When two tasks both need thinking, your mind usually cannot work on them together. It jumps from one to the other, and each jump costs a little time and information. That is why reading while replying to messages can feel busy but produce weaker work.

The problem it solves

The idea matters because many tools are designed to interrupt you: alerts, open tabs and conversations all compete for the same attention. People once treated quick switching as a sign of efficiency, but research showed that interruptions often increase mistakes and the time needed to finish.

A small test

Copy the numbers 1 to 10, then the letters A to J: 1, 2, 3… A, B, C… Now alternate them: 1, A, 2, B, 3, C. The alternating list usually takes longer and causes more slips because your attention must keep changing rules.

The reasonable mistake

A common thought is, “I answered the message while studying, so I saved time.” That feels reasonable because both actions happened during the same minutes. The hidden cost is that you may reread the page, lose your place or repair an error later.

A practical choice

For work that needs concentration, put the phone out of reach, close unnecessary tabs and choose one short task. You do not need perfect silence or to avoid every interruption. The useful rule is to protect the parts of your day when mistakes would matter most.

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