Need help with binary please.

Sign Magnitude 8-bit binary to decimal

1. Convert the Sign-Magnitude binary quantity 01010001 to decimal

2.Convert the Sign-Magnitude binary quantity 01100111 to decimal

3. Convert the Sign-Magnitude binary quantity 11110100 to decimal

4.Convert the Sign-Magnitude binary quantity 11000100 to decimal

5.Convert the Sign-Magnitude binary quantity 10010001 to decimal