Final answer:
The expanded form of 435 is 400 + 30 + 5.
Step-by-step explanation:
The Hindu-Arabic numeral system, which is the one commonly used today, is a positional numeral system with base 10. In this system, each digit's value depends on its position in the number. To write 435 in expanded form, we need to break it down into its place values.
435 = (4 x 100) + (3 x 10) + (5 x 1)
Therefore, the expanded form of 435 is 400 + 30 + 5.