RECORD 1 / 20 · CODESClock starts on first answer
Which field in the copy doesn't match the original?
FIELDORIGINALCOPY · TAP THE ERROR
SHEET-SCAN DRILL · CLOCK STARTS ON FIRST TAP
Flag every row that doesn't match
Real checking jobs are whole sheets, not single records. Tap each row where the copy differs, then check. Flagging a correct row costs as much as missing a wrong one, so speed alone won't win.
#CODEAMOUNTCODE (COPY)AMOUNT (COPY)
What this error checking test measures, in short
An error checking test measures how quickly and accurately you can compare information and spot differences: swapped digits, misspelt names, wrong dates, letters mistaken for numbers. Employers use them for roles where small mistakes are costly, such as admin, finance, data entry and logistics.
Each record has at most one error; five of the twenty have none. Your time is shown alongside your score because real tests weigh both. The test is our own and not normed.
By What's Your IQ · Reviewed 4 Oct 2026- Format
- 20 original-vs-copy records, 5 answer choices
- Data types
- Codes, numbers, names, dates and times, addresses
- Timing
- Clock starts on your first answer
- Bonus
- 12-row sheet scan with false-alarm scoring
“the”is where readers miss the most lettersAsked to cross out every t in a passage, people skip far more in common words like “the” than in rare ones, because familiar words are read as whole units. It's called the missing-letter effect.2
1933The Minnesota Clerical Test.One of the first standardised checking tests: pairs of numbers and names marked same or different, against the clock.
1976The missing-letter effect.Alice Healy showed that readers skip letters in common words, so familiar text hides errors best.
TodaySpeed and accuracy, scored together.Modern checking tests count right answers, errors and time, because a fast checker who misses mistakes isn't useful.
TipCheck in chunks.Read numbers in small groups (812 · 50) and say names in your head letter by letter. It defeats the brain's habit of filling in what it expects.
- Andrew, D. M., Paterson, D. G., & Longstaff, H. P. (1933). Minnesota Vocational Test for Clerical Workers. Psychological Corporation.
- Healy, A. F. (1976). Detection errors on the word the: Evidence for reading units larger than letters. Journal of Experimental Psychology: Human Perception and Performance, 2(2), 235–242.