Speed Maths is a free online training tool from Logicology that builds calculation speed and accuracy for students preparing for competitive exams, where every second saved on arithmetic goes back to reasoning. It runs in the browser on phones, tablets and computers, with no sign-up.
Pick a game, choose whether to tap the answer or type it, then race through 10 questions or 20 timed questions. The results show how many you got right, your accuracy, your time and your seconds per correct answer, so you can see yourself getting faster.
Also try Colour Sudoku, a free 4×4 logic puzzle, and Logicology's screen-free maths board games.

Logicology
Speed Maths ⚡
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