Countdown Numbers Atlas

Every distinct six-tile selection from the numbers round (four large tiles 25, 50, 75, 100 and two each of 1–10), solved exhaustively for every legal target from 100 to 999. Tap a selection to see which targets it can and cannot make.

Large tiles

Choose any four different whole numbers from 11 to 100. The standard set loads instantly; any other set is solved in your browser, which takes a few seconds.
Large tileSmall tileReachable targetUnreachable

Rules used: each tile at most once, not every tile needs to be used, operations +, −, ×, ÷, and every intermediate result must be a positive whole number (no negatives, zero or fractions). Selections are multisets, so 100 75 3 3 2 1 is listed once no matter which order the tiles were drawn.