Hi, My name's Shawn and I'm very interested in this project, especially as I'm a hardware designer and programming FPGA using Verilog and VHDL every day :) I can do the calculator and multiplier as you wish.
I can also complete your project within your budget. I love love love dealing with different types of Verilog project :) Plus this one sounds like it's going to be a cool one :D
As for turnaround, I can start from today and I always strive to guarantee my clients 100% satisfaction and I'll be happy to complete this project with UNLIMITED revisions till you get 100% satisfaction.
If you have any questions for me then feel free to ask. Thank you for your time, I look forward to hearing back from you and hopefully working together to complete your projects.
Kind regards