To add numbers, simply tap on the first number, then tap the addition (+) button, followed by the second number. Tap 'Calculate' to get the sum.

Yes, for multiplication, select the first number, press the multiplication (x) button, choose the second number, and then tap 'Calculate'.

The 100 Square Calc app is designed to help users practice and improve their skills in basic arithmetic operations: addition and multiplication.

Currently, the app focuses on quick calculation results. For detailed steps, you might need to use a dedicated educational tool that offers step-by-step explanations.