LOT 894 collection

Games

Practise mental arithmetic in the browser with adaptive difficulty and clear performance feedback.

Available tools

Choose a focused practice game for mental arithmetic or Soroban place-value skills.

GamesAbacus QuestPractise place value and arithmetic with Soroban challenges and a learning report. GamesMental Math RushPractise arithmetic speed and accuracy with adaptive rounds and a performance report.

Explore the complete directory or continue with another focused collection.

All CalculatorsBrowse every completed LOT 894 calculator and tool. Finance CalculatorsSavings, compound growth, retirement, credit, APR, salary, payroll and tipping tools. Health CalculatorsBMI, ideal-weight and pregnancy timeline tools. Date & Time CalculatorsAge, birthday milestones and calendar date differences. Math CalculatorsPercentages and polynomial roots. ConvertersNumber forms, measurement units and currencies. Education CalculatorsGPA and chemistry reference tools.

Last updated: 3 August 2026