A Simple Mathematics Error Log for Practice Sessions - Blog - Adawa.at

Turn practice mistakes into specific revision tasks with a worked example and a copyable error-log format.

An error log records a problem, where your attempt went wrong, and what you will try next. You do not need to copy every exercise. Choose mistakes that reveal an unclear concept or a recurring habit so that your next review has a clear purpose.

Make an independent attempt:
Try the Random Math Question Generator, or choose a textbook exercise. Work on paper before checking the answer. Keep the incorrect attempt; it shows where the reasoning changed direction.

A format to copy:
- Problem or concept
- My first attempt
- The exact error
- Why it happened
- Correction and explanation
- A new check question
- Review date and result

Worked example:
Find 20% of 150.
Incorrect attempt: 150 ÷ 20 = 7.5.
Cause: treating 20% as the number 20 instead of twenty out of one hundred.
Correction: 20 ÷ 100 = 0.2, then 150 × 0.2 = 30.
Mental check: 10% of 150 is 15, so 20% is 30.
Use the Percentage Calculator after writing your steps. Then try 20% of 80 without looking at the example; the answer is 16.

Describe the error precisely:
Was it reading the question, choosing an operation, calculating, or writing the unit? “I was careless” gives you little to act on. “Identify the whole quantity before calculating the percentage” is a specific next step. Thakerly’s mathematics study guide (Arabic) connects this kind of review with understanding and practice.

Revisit the entry:
Cover the correction and attempt the problem later, then try different numbers. If the same difficulty remains, return to the concept or ask your teacher to explain the step. Record when you can both solve the problem and explain your reasoning.