Combine two numbers

How can I archive the following in Go? Let's say I have two int32 which both have the value 33.
How can I combine them into one int32 with the value 3333 instead of 66?

var a, b int32 = 33, 33
a = a*100 + b
fmt.Println(a)

Playground.

Edit: Here is a version which computes the padding depending on the number:

func main() {
    var a, b int32 = 1234, 456
    a = a*padding(b) + b
    fmt.Println(a)
}

func padding(n int32) int32 {
    var p int32 = 1
    for p < n {
        p *= 10
    }
    return p
}

Playground.

Note that you should also check that int32 won't overflow. If you don't want to worry about overflows, you can use a big.Int instead.