You can remove multiple scopes from your DHCP server by using this simple script which uses the Remove-DhcpServerv4Scope PowerShell cmdlet.
The script assumes you have scope IDs in a series (I have scope IDs of 10.0.0.0, 22.214.171.124 and 126.96.36.199).
Delete Multiple DHCP Scopes Using PowerShell
Step 1. Open notepad and copy/paste the following script and save the file with .ps1 extension. Be sure to replace your DHCP name in the script and loop variables (according to the range of scopes you have)
for ($i = 10;$i -lt 13;$i++)
$ScpID = $i.ToString() + ".0.0.0"
Remove-DhcpServerv4Scope -computername "Server2016.yourdomain.com" -ScopeId $ScpID -Force
Step 2. Open PowerShell with elevated privileges and execute the above script from step 1