100 Square Calc: Add & Mul

10x10 simple 100 square calculation.

It supports addition and multiplication, and can record time on a graph.

Improves calculation skills and mental arithmetic skills, and helps train the brain.

Functions/Features

- Addition 100 Squares Calculation

- Multiplication 100 Squares Calculation

- Smooth numeric input

- Measure your time

- Record in graph

- Display personal best/average time

- Customization (dark mode, theme colors)

- Simple design compliant with Material Design