Give this a try:
https://docs.rainmeter.net/manual/variables/section-variables/#Decimals
Code:
[MeterCPU2A]Meter=STRINGX=1rY=-1rFontColor=#TxtColor#StringStyle=BOLDFontSize=7StringAlign=CENTERFontFace=#FontName#Text=[MeasureCPUUsage:0]%DynamicVariables=1AntiAlias=1Statistics: Posted by jsmorley — Today, 1:18 am