When objects are bundled in groups of ones, tens, and hundreds, it can be helpful to use a place-value chart with columns for ones, tens, and hundreds!
Place 1 dot for each single object in the ones column.
Place 1 dot for each bundle of 10 objects in the tens column.
Place 1 dot for each bundle of 100 objects in the hundreds column.
The number of dots in the hundreds column will be the first digit in our number, the number of dots in the tens column will be the second digit, and the number of dots in the ones column will be the third digit.