If you have two instances of BigDecimal as following

val a = 7.5.toBigDecimal()
val b = 7.50.toBigDecimal()

It seems that they are equal in value and should return true when doing a == b but they don't. The reason is that b is more precise than a and therefore not equal in value.

So to compare the magnitude of two BigDecimals (while ignoring their precision) we need to use a.compareTo(b). When both the numbers are same in magnitude compareTo returns 0.

So in Kotlin we can create an extension function like this

fun BigDecimal.isEqualInMagnitude(num: BigDecimal): Boolean {
    return this.compareTo(num) == 0
}

And then when we need to compare two numbers we can simply do

val a = 7.5.toBigDecimal()
val b = 7.50.toBigDecimal()

if (a.isEqualInMagnitude(b)) {
    println("Equal in magnitude")
} else {
    println("Magnitudes of both numbers don't match")
}