Complete the expansion of $(a+b)^6$ with $a=1$ and $b=0.3$.

$(1+0.3)^6=(\square)^6+6(\square)^5(\square)+15(\square)^4(\square)^2+20(\square)^3(\square)^3+15(\square)^2(\square)^4+6(\square)(\square)^5+(\square)^6$