Precise Numeric Data Entry

I have a batch of purely numeric records that must be keyed in quickly and, above all, accurately. The original figures live in several places—some scanned pages, a small online repository, and a few legacy spreadsheets—so you should be comfortable pulling data from whichever source I supply... (Budget: ₹12500 - ₹37500 INR, Jobs: Data Cleansing, Data Entry, Data Management, Data Mining, Data Processing, Database Management, Excel, Google Sheets)