diff --git a/http/budgeting.go b/http/budgeting.go
index c0bed4f..431c3b7 100644
--- a/http/budgeting.go
+++ b/http/budgeting.go
@@ -192,7 +192,6 @@ func (h *Handler) calculateBalances(c *gin.Context, budget postgres.Budget, firs
 				categoryWithBalance.Activity = bal.Transactions
 				categoryWithBalance.Assigned = bal.Assignments
 			}
-
 		}
 
 		// do not show hidden categories
diff --git a/postgres/numeric.go b/postgres/numeric.go
index 38e75b1..b5079c2 100644
--- a/postgres/numeric.go
+++ b/postgres/numeric.go
@@ -44,7 +44,7 @@ func (n Numeric) IsZero() bool {
 }
 
 func (n Numeric) MatchExp(exp int32) Numeric {
-	diffExp := exp - n.Exp
+	diffExp := n.Exp - exp
 	factor := big.NewInt(0).Exp(big.NewInt(10), big.NewInt(int64(diffExp)), nil)
 	return Numeric{pgtype.Numeric{
 		Exp:    exp,
@@ -55,34 +55,36 @@ func (n Numeric) MatchExp(exp int32) Numeric {
 }
 
 func (n Numeric) Sub(o Numeric) Numeric {
-	if n.Exp > o.Exp {
-		o = o.MatchExp(n.Exp)
-	} else if n.Exp < o.Exp {
-		n = n.MatchExp(o.Exp)
+	left := n
+	right := o
+	if n.Exp < o.Exp {
+		right = o.MatchExp(n.Exp)
+	} else if n.Exp > o.Exp {
+		left = n.MatchExp(o.Exp)
 	}
 
-	if o.Exp == n.Exp {
+	if left.Exp == right.Exp {
 		return Numeric{pgtype.Numeric{
-			Exp: n.Exp,
-			Int: big.NewInt(0).Sub(o.Int, n.Int),
+			Exp: left.Exp,
+			Int: big.NewInt(0).Sub(left.Int, right.Int),
 		}}
 	}
 
 	panic("Cannot subtract with different exponents")
 }
 func (n Numeric) Add(o Numeric) Numeric {
-	fmt.Println("N", n, "O", o)
-	if n.Exp > o.Exp {
-		o = o.MatchExp(n.Exp)
-	} else if n.Exp < o.Exp {
-		n = n.MatchExp(o.Exp)
+	left := n
+	right := o
+	if n.Exp < o.Exp {
+		right = o.MatchExp(n.Exp)
+	} else if n.Exp > o.Exp {
+		left = n.MatchExp(o.Exp)
 	}
 
-	fmt.Println("NM", n, "OM", o)
-	if o.Exp == n.Exp {
+	if left.Exp == right.Exp {
 		return Numeric{pgtype.Numeric{
-			Exp: n.Exp,
-			Int: big.NewInt(0).Add(o.Int, n.Int),
+			Exp: left.Exp,
+			Int: big.NewInt(0).Add(left.Int, right.Int),
 		}}
 	}