Skill: Compose numbers from place-value parts

To compose a number, combine its place-value parts:

• Each hundred is worth $100$.
• Each ten is worth $10$.
• Each one is worth $1$.

Example: Compose a number with 5 hundreds, 2 tens, and 0 ones.

1. Find the value of each part:

   • 5 hundreds: $5 \times 100 = 500$
   • 2 tens: $2 \times 10 = 20$
   • 0 ones: $0 \times 1 = 0$

2. Add the parts:

$$500+20+0=520$$

3. Write the number in different forms:
   • Standard form: $520$
   • Expanded form: $500+20+0$
   • Place-value form: 5 hundreds, 2 tens, and 0 ones

The zero shows that there are no ones. Therefore, 5 hundreds, 2 tens, and 0 ones compose the number $\boxed{520}$.