Error Checking

Practice error checking: quickly compare numbers, codes, and text to spot discrepancies between data sets. Free speed and accuracy practice for aptitude tests.

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Compare the two columns and find the errors:

How many rows contain errors?

Explanation

 
How It Works
Error checking tests measure your ability to compare data sets and identify discrepancies. You'll compare numbers, codes, and text to find where differences occur between an original and a copy.
These tests assess attention to detail and accuracy under time pressure—essential skills for data entry, accounting, quality control, and administrative roles. Our procedurally generated comparisons include transpositions, substitutions, and missing characters at varying difficulty levels, ensuring unlimited unique practice.
All comparisons are generated locally in your browser. Your progress and answers are stored only on your device — we never collect any personal data.
Frequently Asked Questions
Look for transpositions (1234 vs 1324), substitutions (1234 vs 1284), missing characters (1234 vs 134), and extra characters (1234 vs 12345). Errors are subtle, so check each character carefully.
Banks, accounting firms, insurance companies, law firms, healthcare organizations, and any role involving data entry or document processing. SHL, Talent Q, and Cubiks all offer error checking assessments.
Scan systematically row by row, character by character. Use a finger or cursor to track position. Focus on one row at a time. Practice improves speed and accuracy—aim for zero errors before speeding up.
Each comparison is procedurally generated using realistic data formats including numbers, alphanumeric codes, and text strings. The system introduces specific error types — transpositions, substitutions, insertions, and deletions — at controlled rates based on the difficulty level. This ensures every practice set is unique and has a single correct answer.
Commonly Used In
Error Checking skills are frequently assessed in recruitment and professional development across a range of industries and roles. Practicing these question types will help you prepare for aptitude tests from providers like SHL, Korn Ferry, Cubiks, and Talent Q.
Clerical RolesData EntryQuality AssuranceAdmin Positions
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