Make 6 with four 4s

The classic four fours puzzle: build an expression from exactly four 4s that equals 6. 6 can be made with nothing but four 4s, + - × ÷, and parentheses.

Solutions using only + - × ÷

(4 + 4) / 4 + 4 = 6

Solutions with concatenation and decimals

.4 × 4 + 4.4 = 6
4 × 4 - 4 / .4 = 6
.4 × 4 × 4 - .4 = 6
.4 × 4 + .4 + 4 = 6
.4 + .4 × 4 + 4 = 6

…and 2 more at this tier.

Solutions with square roots, factorials, exponents

4! × 4 / 4 / 4 = 6
4! / 4 × 4 / 4 = 6
4! / 4 + 4 - 4 = 6
4 × 4! / 4 / 4 = 6
4 + 4! / 4 - 4 = 6

…and 2654 more at this tier.

2667 distinct solutions found in total, after removing trivial rearrangements.

Make 5 with four 4s · Make 7 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

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