45 × 55 = ? 😱 Romania Multiplication Trick in 5 Seconds | Fast Maths Trick #shorts

Added: 2026-06-03

The Romania Multiplication Trick is a mental math technique for quickly multiplying two numbers that end in 5 (such as 45 × 55). The method involves multiplying the tens digits, adding 2.5 to the result, and then appending 25 to the end. For example, to calculate 45 × 55: multiply 4 × 5 = 20, add 2.5 to get 22.5, and append 25 to obtain 2475. This trick provides a fast way to solve such multiplication problems in seconds.