Vicky came home from the matinee at 5: 45 pm the cinema was 1/2 hour each way. she spent 2 1/4 hours at the cinema. what time did she leave home?

The digit 1 is the least significant digit.

The higher the place value, the higher the significance of the digit.
The digit 3 stands for 30 000 and the digit 4 stands for 4000. 
⇒ The digit 3 is more significant than the digit 4

The digit 4 stands for 4000 and digit 1 stands for 1.
⇒ The digit 4 is more significant than the digit 1.

The digit 1 is the least significant digit.