burger fun / Four Nines / Solver

Make 97 with four 9s

The classic four nines puzzle: build an expression from exactly four 9s that equals 97. 97 cannot be made with + - × ÷, concatenation, or decimals (the solver checked every expression) — solutions need square roots, factorials, or exponents.

Solutions using only + - × ÷

No expression made of four plain 9s and + - × ÷ reaches 97 — the solver checked every possible expression.

Solutions with concatenation and decimals

Concatenation and decimals do not help for 97 either — every combination was checked.

Solutions with square roots, factorials, exponents

• 99 - sqrt(9)! / sqrt(9) = 97

1 distinct solutions found in total, after removing trivial rearrangements.

Make 96 with four 9s · Make 98 with four 9s

The Number Lab

Same idea, different constraints: four 9s, four 4s, or any four digits you like.

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Play the daily Four Nines puzzle, pick another number in the solver, or find more free math games.