diff --git a/pkg/strategy/xbalance/strategy.go b/pkg/strategy/xbalance/strategy.go
index 717538246..8499dd428 100644
--- a/pkg/strategy/xbalance/strategy.go
+++ b/pkg/strategy/xbalance/strategy.go
@@ -52,7 +52,7 @@ func (s *State) SlackAttachment() slack.Attachment {
 		Title: s.Asset + " Transfer States",
 		Fields: []slack.AttachmentField{
 			{Title: "Total Number of Transfers", Value: fmt.Sprintf("%d", s.DailyNumberOfTransfers), Short: true},
-			{Title: "Total Amount of Transfers", Value: util.FormatFloat(s.DailyAmountOfTransfers.Float64(), 4), Short: true},
+			{Title: "Total Amount of Transfers", Value: s.DailyAmountOfTransfers.String(), Short: true},
 		},
 		Footer: templateutil.Render("Since {{ . }}", time.Unix(s.Since, 0).Format(time.RFC822)),
 	}
diff --git a/pkg/util/math.go b/pkg/util/math.go
deleted file mode 100644
index 1159ff59d..000000000
--- a/pkg/util/math.go
+++ /dev/null
@@ -1,28 +0,0 @@
-package util
-
-import (
-	"strconv"
-
-	"github.com/c9s/bbgo/pkg/fixedpoint"
-)
-
-const MaxDigits = 18 // MAX_INT64 ~ 9 * 10^18
-
-var Pow10Table = [MaxDigits + 1]int64{
-	1, 1e1, 1e2, 1e3, 1e4, 1e5, 1e6, 1e7, 1e8, 1e9, 1e10, 1e11, 1e12, 1e13, 1e14, 1e15, 1e16, 1e17, 1e18,
-}
-
-func Pow10(n int64) int64 {
-	if n < 0 || n > MaxDigits {
-		return 0
-	}
-	return Pow10Table[n]
-}
-
-func FormatValue(val fixedpoint.Value, prec int) string {
-	return val.FormatString(prec)
-}
-
-func FormatFloat(val float64, prec int) string {
-	return strconv.FormatFloat(val, 'f', prec, 64)
-}