Operational amplifiers can be used for simulating mathematical operations like addition, integration, differentiation etc.
Make a summing amplifier using an Op-Amp and test it.
The output is given by Vout = (R1)/(Rf)V1 + (R2)/(Rf)V2 + ...
The summation can be done using AC waveforms also. Our supply voltage is only 6V. So the output should be kept less than 4V.