Keep the base, units and operation visible.
Review percentages, ratios, means, one-off costs, increases and constant rates. Worked arithmetic identifies a missed step without assigning mathematical ability.
Six original tasks each count one correct answer. Your count out of six describes these tasks under your practice conditions, not a percentile, IQ estimate or fixed ability band. All worked answers and this complete guide remain available at every count.
What these six tasks check
The questions ask you to choose the correct base for a percentage, divide a total into ratio parts, calculate an arithmetic mean, add a one-off charge, distinguish an increase from the final value and scale time at a stated constant rate. Each supplies the needed quantities. No external price, employer benchmark or real worker’s productivity is assumed.
A separate ratio example
Suppose two fictional batches total 72 units in the ratio 5:4. There are nine parts, so one part is eight units; the batches contain 40 and 32. Check that they add back to 72 and keep the requested batch distinct. A correct calculation for the first batch is still the wrong response if the question asks for the second.
Locate the step, not an ability label
Compare your selected option with the worked key. Did you use the wrong denominator, report only the increase, repeat a delivery charge or confuse the mean with the median? These are different errors with different repairs. A result of zero, three or six correct does not show how you perform across all numerical tasks or under an employer’s timed conditions.
Rehearse a checking loop
Write what is being requested, attach units to each given value and produce a short expression before calculating. Estimate the size of the result, then check it against the original total or rate. Change one number in an invented example and solve again before viewing the explanation. Paper or a calculator is allowed here; keep your chosen conditions consistent when comparing attempts.
A small original practice set
The answer keys were independently recomputed using exact fractions and arithmetic. That establishes consistency for these cases, not a general aptitude norm. No speed is measured. Familiarity and rereading answers can improve a repeat count without proving a wider skill change. Use the item explanations to choose the next kind of calculation to practise.