diff --git a/v/euler/euler.v b/v/euler/euler.v
index 405b57f..645fb66 100644
--- a/v/euler/euler.v
+++ b/v/euler/euler.v
@@ -9,6 +9,8 @@ pub fn range(start int, end int) []int {
 	return result
 }
 
+pub fn add(i int, j int) int { return i + j }
+
 pub fn even(n int) bool {
 	return n % 2 == 0
 }
diff --git a/v/euler001.v b/v/euler001.v
index e2e38b3..87632c5 100644
--- a/v/euler001.v
+++ b/v/euler001.v
@@ -1,17 +1,10 @@
+import euler
+
 fn multiples_of_three_and_five_below(n int) []int {
-	mut nums := []int
-	for i := 3; i < n; i++ {
-		if i % 3 == 0 || i % 5 == 0 {
-			nums << i
-		}
-	}
-	return nums
+  nums := euler.range(3, n-1)
+  return nums.filter(it % 3 == 0 || it % 5 == 0)
 }
 
 fn main() {
-	mut result := 0
-	for n in multiples_of_three_and_five_below(1000) {
-		result += n
-	}
-	println(result)
+	println(multiples_of_three_and_five_below(1000).reduce(euler.add, 0))
 }
diff --git a/v/euler002.v b/v/euler002.v
index cd78c5e..e0398d9 100644
--- a/v/euler002.v
+++ b/v/euler002.v
@@ -14,9 +14,5 @@ fn even_fibonacci_up_to(n int) []int {
 }
 
 fn main() {
-  mut result := 0
-  for n in even_fibonacci_up_to(4000000) {
-    result += n
-  }
-  println(result)
+  println(even_fibonacci_up_to(4000000).reduce(euler.add, 0))
 }