Built-In Calculator for Transaction Amount Entry

When entering a transaction amount, it would be incredibly helpful if the number pad already included a simple built-in calculator with the four basic operations: addition, subtraction, multiplication, and division. This would make quick computations much easier without needing to leave the app. For example, if a user is splitting a dinner bill in half, they could simply type the total amount, tap divide by 2, and instantly enter the correct figure. It would make expense logging faster, smoother, and more convenient, especially for real-life situations like splitting bills, calculating discounts, or combining multiple small purchases.