Make 57 with four 4s

The classic four fours puzzle: build an expression from exactly four 4s that equals 57. 57 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 4s and + - × ÷ reaches 57 — the solver checked every possible expression.

Solutions with concatenation and decimals

Concatenation and decimals do not help for 57 either — every combination was checked.

Solutions with square roots, factorials, exponents

(.4 + 4!) / .4 - 4 = 57
(4! - .4) / .4 - sqrt(4) = 57
(4! - sqrt(4)) / .4 + sqrt(4) = 57
sqrt(4) - (sqrt(4) - 4!) / .4 = 57

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

How 57 compares

57 has 4 distinct solutions across all three tiers — #11 scarcest of the 95 solvable targets. Next door, 56 has 102 solutions and 58 has 42 solutions. The nearest impossible target is 73, 16 away — proven unreachable, not just unsolved.

If 57 went down easily, make 67 with four 4s — just one solution, the nearest step up in scarcity.

Make 56 with four 4s · Make 58 with four 4s

The Number Lab

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

Four Nines — the daily puzzle
Four Nines solver — every target, solved
Four Fours — the 1881 original
Four Fours solver — including the impossible five
Make 24 solver — any four digits
Today's 24 — one new hand a day

Got what you came for?

Stay for something you did not search for.

Four Nines — the daily sibling: four 9s, one target, new at midnight
The Reflex Lab — nine ways to measure your hands and memory, none of them polite about it
hand me something weird — a random pick from the directory. Could be the horse.

Read up on the 1881 original, pick another number in the solver, or find more free math games.