diff --git a/pkg/list/math.go b/pkg/list/math.go
new file mode 100644
index 0000000..4ce4ba3
--- /dev/null
+++ b/pkg/list/math.go
@@ -0,0 +1,99 @@
+// Copyright 2018 The CUE Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package list
+
+import (
+	"fmt"
+
+	"cuelang.org/go/internal"
+	"github.com/cockroachdb/apd/v2"
+)
+
+// Avg returns the average value of a non empty list xs.
+func Avg(xs []*internal.Decimal) (*internal.Decimal, error) {
+	if 0 == len(xs) {
+		return nil, fmt.Errorf("empty list")
+	}
+
+	s := apd.New(0, 0)
+	for _, x := range xs {
+		_, err := internal.BaseContext.Add(s, x, s)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	var d apd.Decimal
+	l := apd.New(int64(len(xs)), 0)
+	_, err := internal.BaseContext.Quo(&d, s, l)
+	if err != nil {
+		return nil, err
+	}
+	return &d, nil
+}
+
+// Max returns the maximum value of a non empty list xs.
+func Max(xs []*internal.Decimal) (*internal.Decimal, error) {
+	if 0 == len(xs) {
+		return nil, fmt.Errorf("empty list")
+	}
+
+	max := xs[0]
+	for _, x := range xs[1:] {
+		if -1 == max.Cmp(x) {
+			max = x
+		}
+	}
+	return max, nil
+}
+
+// Min returns the minimum value of a non empty list xs.
+func Min(xs []*internal.Decimal) (*internal.Decimal, error) {
+	if 0 == len(xs) {
+		return nil, fmt.Errorf("empty list")
+	}
+
+	min := xs[0]
+	for _, x := range xs[1:] {
+		if +1 == min.Cmp(x) {
+			min = x
+		}
+	}
+	return min, nil
+}
+
+// Product returns the product of a non empty list xs.
+func Product(xs []*internal.Decimal) (*internal.Decimal, error) {
+	d := apd.New(1, 0)
+	for _, x := range xs {
+		_, err := internal.BaseContext.Mul(d, x, d)
+		if err != nil {
+			return nil, err
+		}
+	}
+	return d, nil
+}
+
+// Sum returns the sum of a list non empty xs.
+func Sum(xs []*internal.Decimal) (*internal.Decimal, error) {
+	d := apd.New(0, 0)
+	for _, x := range xs {
+		_, err := internal.BaseContext.Add(d, x, d)
+		if err != nil {
+			return nil, err
+		}
+	}
+	return d, nil
+}