How did my instructor get this wildcard mask?

We're currently learning about wildcard masks. On our worksheet, the first two answers are given to us.

1. Create a wildcard mask to match this exact address. IP address: 192.168.25.70 Subnet mask: 255.255.255.0

2. Create a wildcard mask to match this range. IP address: 210.150.10.0 Subnet address: 0.0.0.255

Answers: 1. 0.0.0.0

1. 0.0.0.255

Wouldn't the first problem's wildcard mask be the same as the second one's?

How did he get 0.0.0.0?