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Digit Challenge practice and equation solver (Aon, P&G)

The Digit Challenge is the equation game in Aon's smartPredict assessment, used in the P&G Interactive Assessment and by other employers. Use the builder to reconstruct the equation from your question, mark the blanks and set the target, and the solver lists every digit combination that works. Seeing the full set of solutions is more useful than receiving one answer: it shows you which kinds of combination are worth trying first, which is exactly what makes the difference under time pressure.

Equation

(

)

Use the buttons to add blanks, operators or parentheses; switch an operator with its dropdown; hover an element and click × to remove it.

Templates

Click any equation to apply it.

Options

Digit range

No repeats

Result

Press “Solve” to see every digit combination that works.

Triple-product table: three distinct digits from 1–9

Use this table before your assessment to learn products of three distinct digits. It contains all 84 unordered combinations from 1–9, sorted by product. Reordering factors does not change the result. Zero and repeated digits are excluded; some products have multiple combinations.

Original example: a × b × c + d = 122

For four distinct digits from 1–9, try d = 2. The remaining product is 120. The table gives 3 × 5 × 8 = 120 and none of those digits is 2, so 3 × 5 × 8 + 2 = 122 is one valid answer. Check all other constraints; one answer does not prove uniqueness.

View the full table (84 combinations)

Independently generated mathematics reference, not official assessment material.
Product	Three distinct digits
6	1 × 2 × 3
8	1 × 2 × 4
10	1 × 2 × 5
12	1 × 2 × 6
12	1 × 3 × 4
14	1 × 2 × 7
15	1 × 3 × 5
16	1 × 2 × 8
18	1 × 2 × 9
18	1 × 3 × 6
20	1 × 4 × 5
21	1 × 3 × 7
24	1 × 3 × 8
24	1 × 4 × 6
24	2 × 3 × 4
27	1 × 3 × 9
28	1 × 4 × 7
30	1 × 5 × 6
30	2 × 3 × 5
32	1 × 4 × 8
35	1 × 5 × 7
36	1 × 4 × 9
36	2 × 3 × 6
40	1 × 5 × 8
40	2 × 4 × 5
42	1 × 6 × 7
42	2 × 3 × 7
45	1 × 5 × 9
48	1 × 6 × 8
48	2 × 3 × 8
48	2 × 4 × 6
54	1 × 6 × 9
54	2 × 3 × 9
56	1 × 7 × 8
56	2 × 4 × 7
60	2 × 5 × 6
60	3 × 4 × 5
63	1 × 7 × 9
64	2 × 4 × 8
70	2 × 5 × 7
72	1 × 8 × 9
72	2 × 4 × 9
72	3 × 4 × 6
80	2 × 5 × 8
84	2 × 6 × 7
84	3 × 4 × 7
90	2 × 5 × 9
90	3 × 5 × 6
96	2 × 6 × 8
96	3 × 4 × 8
105	3 × 5 × 7
108	2 × 6 × 9
108	3 × 4 × 9
112	2 × 7 × 8
120	3 × 5 × 8
120	4 × 5 × 6
126	2 × 7 × 9
126	3 × 6 × 7
135	3 × 5 × 9
140	4 × 5 × 7
144	2 × 8 × 9
144	3 × 6 × 8
160	4 × 5 × 8
162	3 × 6 × 9
168	3 × 7 × 8
168	4 × 6 × 7
180	4 × 5 × 9
189	3 × 7 × 9
192	4 × 6 × 8
210	5 × 6 × 7
216	3 × 8 × 9
216	4 × 6 × 9
224	4 × 7 × 8
240	5 × 6 × 8
252	4 × 7 × 9
270	5 × 6 × 9
280	5 × 7 × 8
288	4 × 8 × 9
315	5 × 7 × 9
336	6 × 7 × 8
360	5 × 8 × 9
378	6 × 7 × 9
432	6 × 8 × 9
504	7 × 8 × 9

For preparation before the assessment. Follow the employer’s rules on reference materials during the actual test.

What is the Digit Challenge?

The Digit Challenge is one of the gamified tests in Aon's smartPredict assessment. P&G uses it in its Interactive Assessment, so many candidates know it as the P&G Digit Challenge, but other employers that use Aon assessments can include it too.

The Digit Challenge is the numerical game in the P&G Interactive Assessment. Each question shows an equation with blanks, such as _ × _ + _ = 47, and you fill the blanks with single digits so that the equation is true. Candidates commonly report that a digit can be used only once per equation, that there is a time window of around five minutes, and that equations get longer as you progress.

It is less about arithmetic speed than about narrowing the search: the target, parity, divisibility and the largest possible product tell you which digits are worth trying first.

A fast method for Digit Challenge equations

Start with the operation that moves the result most, usually the multiplication.
Bound it: if the target is 47 and the last term is at most 9, the product must be between 38 and 46.
List the digit pairs that give a product in that range, then see whether the remaining digit closes the gap.
Check that no digit repeats if the rule says digits must be distinct.

Worked example

Solve a × b + c = 47 using digits 1 to 9, all different. The product must be between 38 and 46. 5 × 8 = 40 needs c = 7, which works, so 5 × 8 + 7 = 47 is a valid answer. 6 × 7 = 42 needs c = 5, which also works. The solver above lists every combination, which shows you how many answers a question like this really has.

The three-digit product table on this page helps you recognise products of three different digits at a glance, which is the step that slows most people down in longer equations.

Digit Challenge FAQ

How long is the P&G Digit Challenge?

Candidates usually report about five minutes with as many equations as you can complete. Follow the instructions on your own invitation, because timings can change.

Can I use the same digit twice in the Digit Challenge?

Candidates commonly report that each digit can appear only once per equation. The solver lets you switch the distinct-digits rule on or off so you can practise either way.

Do I follow normal order of operations?

Yes, practise with standard precedence: multiplication and division before addition and subtraction, and brackets first. The solver uses the same rule.

Can I use a calculator?

Practise without one. The questions are designed for mental arithmetic, and the skill being measured is how quickly you eliminate impossible digits.

How to use it, and what it does not do

Choose the digit range 1-9 or 0-9 and switch the no-repeats constraint on or off. Both directly change the search space, so match them to your question.
Standard operator precedence applies: multiplication and division before addition and subtraction, brackets first.
When the number of combinations is very large, only the first several solutions are shown with a notice. Narrow the digit range or use fewer blanks in that case.

Numerical reasoning guide Start practising

This is an independent practice tool. It is not affiliated with, endorsed by, or connected to Procter & Gamble, Aon, SHL or any employer named on this site. Every question here is generated from publicly described question formats and is not real test content from any company. Company and test names are trademarks of their respective owners.