Answer:
369
Explanation:
Think about place value. You will align the last number of each number to its place value given and fill in the spaces left with zeroes.
HUNDREDS TENS ONES
19 ones = 19 0 1 9
5 tens = 50 0 5 0
3 hundreds = 300 3 0 0
Then to get the number, all you need to do is add them up together:
300 + 50 + 19 = 369