diff --git a/13-loops/exercises/02-sum-the-numbers-verbose/solution/main.go b/13-loops/exercises/02-sum-the-numbers-verbose/solution/main.go
index 487f458..4f989f2 100644
--- a/13-loops/exercises/02-sum-the-numbers-verbose/solution/main.go
+++ b/13-loops/exercises/02-sum-the-numbers-verbose/solution/main.go
@@ -19,7 +19,7 @@ func main() {
 		sum += i
 
 		fmt.Print(i)
-		if i != max {
+		if i < max {
 			fmt.Print(" + ")
 		}
 	}
diff --git a/13-loops/exercises/03-sum-up-to-n/solution/main.go b/13-loops/exercises/03-sum-up-to-n/solution/main.go
index 187cc0a..209e706 100644
--- a/13-loops/exercises/03-sum-up-to-n/solution/main.go
+++ b/13-loops/exercises/03-sum-up-to-n/solution/main.go
@@ -31,7 +31,7 @@ func main() {
 		sum += i
 
 		fmt.Print(i)
-		if i != max {
+		if i < max {
 			fmt.Print(" + ")
 		}
 	}
diff --git a/13-loops/exercises/04-only-evens/solution/main.go b/13-loops/exercises/04-only-evens/solution/main.go
index eede18a..261eef6 100644
--- a/13-loops/exercises/04-only-evens/solution/main.go
+++ b/13-loops/exercises/04-only-evens/solution/main.go
@@ -34,7 +34,7 @@ func main() {
 		sum += i
 
 		fmt.Print(i)
-		if i != max {
+		if i < max-1 {
 			fmt.Print(" + ")
 		}
 	}
diff --git a/13-loops/exercises/05-break-up/solution/main.go b/13-loops/exercises/05-break-up/solution/main.go
index 61e656c..1768d5e 100644
--- a/13-loops/exercises/05-break-up/solution/main.go
+++ b/13-loops/exercises/05-break-up/solution/main.go
@@ -32,18 +32,19 @@ func main() {
 	)
 
 	for {
-		if i%2 != 0 {
+		if i > max {
+			break
+		} else if i%2 != 0 {
 			i++
 			continue
 		}
-		sum += i
 
 		fmt.Print(i)
-		if i != max {
+		if i < max-1 {
 			fmt.Print(" + ")
-		} else {
-			break
 		}
+
+		sum += i
 		i++
 	}
 	fmt.Printf(" = %d\n", sum)