If the numbers are typed into cells A1 and B1

For sum, type in C1

=$A1+$B1


For difference, type in D1

=$A1-$B1


For product, type in E1

=$A1*$B1


For quotient, type in F1

=QUOTIENT($A1,$B1)


For remainder, type in G1

=MOD($A1,$B1)


For exponentiation, type in H1

=$A1^$B1