The numeric part of the quantity 12,345,000 is 12,345,000. The largest place value in this number is in the millions place. Specifically, it can be broken down as follows:
- 12 million (the '12' in million)
- 3 hundred thousand
- 4 ten thousand
- 5 thousand
- 0 hundreds
- 0 tens
- 0 ones
Thus, the largest place value is million.