How the Basic Triple-Digit Math test works
This is the step up from Basic Double-Digit Math: the same four skill areas with three-digit numbers, plus primes and simple fractions in the nearest-number questions. Fifteen questions run on one 10-minute clock, four options each, one per screen.
TestGorilla’s practice set includes a sum with numbers on both sides of the equals sign, a question on which number is not a multiple of a given one, three task durations in hours, minutes and seconds to add up, and the option closest to a product.
Its test page rates it Entry-level and its fact sheet Intermediate. It is aimed at manufacturing and industrial roles that need sound everyday maths.
How to handle the harder question types
The extra content in this test has quick rules:
- Both sides of the equals sign: work out the complete side first, then find the blank on the other side.
- Durations: add the seconds, then the minutes, then the hours, carrying 60 seconds into a minute and 60 minutes into an hour.
- Not a multiple of 12, 15 or 18: split the number into factors and test each. A multiple of 12 must divide by both 3 and 4.
- Primes: test division by primes up to the square root. For 221, try 2, 3, 5, 7, 11 and 13; 221 = 13 × 17, so it is not prime.
- Closest to: round each number, estimate, then compare only the options near your estimate.
Worked examples
Both sides. 415 + ? = 283 + 367. The right side is 650, and 650 − 415 = 235. Check: 415 + 235 = 650.
Durations. Three jobs take 1 h 24 min 50 s, 2 h 47 min 25 s and 38 min 45 s. What is the total? Seconds: 50 + 25 + 45 = 120, which is 2 minutes exactly. Minutes: 24 + 47 + 38 + 2 = 111, which is 1 hour 51 minutes. Hours: 1 + 2 + 1 = 4. The total is 4 h 51 min 0 s. Check in seconds: 5,090 + 10,045 + 2,325 = 17,460, and 17,460 ÷ 3,600 is 4 hours with 3,060 seconds, or 51 minutes, left over.
Not a multiple. Which is not a multiple of 12? Options: 144, 204, 276, 316. A multiple of 12 has digits that add to a multiple of 3 and last two digits that divide by 4. All four pass the 4 test, but the digits of 316 add to 10, which fails the 3 test. The answer is 316.
Tips for the real Basic Triple-Digit Math test
- Use the calculator TestGorilla allows for three-digit products, but estimate first so you notice a typing slip.
- For duration totals, write each column on paper before carrying. Mental carrying across three units is where errors creep in.
- Check every option on not-a-multiple questions. The wrong ones often share a smaller factor with the right one.
- Leave no question unanswered. A skip scores the same as a wrong answer.
- Submit before the final seconds. An answer you have picked but not submitted is lost at time-out.
Practise Basic Triple-Digit Math on CogniPrep
Ours has 15 questions on one 10-minute clock, four options each, generated fresh each sitting across addition and subtraction, multiplication and division, calculating time, and nearest number with primes and fractions. It includes both-sides sums, not-a-multiple questions and durations in hours, minutes and seconds. One question per screen, no going back and a skip marked wrong. You get a raw percentage and a percentile against CogniPrep players, with harder questions weighted more, plus feedback on each skill area.