In the number 345, the 3 is worth 300 because it is in the hundreds column. The 4 is worth forty since it is in the tens column. The 5 is worth 5 since it is in the ones column.
See if you can figure out the answer to each of these:
What is the value of the digit in red? 432 --> (30) 812 --> (800) 147 --> (7) 462 --> (60)