diff --git a/core/math/plane.cpp b/core/math/plane.cpp
index 6881ad40148..926634f1c4e 100644
--- a/core/math/plane.cpp
+++ b/core/math/plane.cpp
@@ -175,5 +175,5 @@ bool Plane::is_equal_approx(const Plane &p_plane) const {
 }
 
 Plane::operator String() const {
-	return "[N: " + normal.operator String() + ", D: " + String::num_real(d, false) + "]";
+	return "[N: " + normal.operator String() + ", D: " + String::num_real(d, true) + "]";
 }
diff --git a/core/math/quaternion.cpp b/core/math/quaternion.cpp
index 11bfcc1a6f5..a6eb98780c9 100644
--- a/core/math/quaternion.cpp
+++ b/core/math/quaternion.cpp
@@ -202,7 +202,7 @@ Quaternion Quaternion::cubic_slerp(const Quaternion &p_b, const Quaternion &p_pr
 }
 
 Quaternion::operator String() const {
-	return "(" + String::num_real(x, false) + ", " + String::num_real(y, false) + ", " + String::num_real(z, false) + ", " + String::num_real(w, false) + ")";
+	return "(" + String::num_real(x, true) + ", " + String::num_real(y, true) + ", " + String::num_real(z, true) + ", " + String::num_real(w, true) + ")";
 }
 
 Vector3 Quaternion::get_axis() const {
diff --git a/core/math/vector2.cpp b/core/math/vector2.cpp
index a27227905ca..a015b713875 100644
--- a/core/math/vector2.cpp
+++ b/core/math/vector2.cpp
@@ -190,7 +190,7 @@ bool Vector2::is_equal_approx(const Vector2 &p_v) const {
 }
 
 Vector2::operator String() const {
-	return "(" + String::num_real(x, false) + ", " + String::num_real(y, false) + ")";
+	return "(" + String::num_real(x, true) + ", " + String::num_real(y, true) + ")";
 }
 
 Vector2::operator Vector2i() const {
diff --git a/core/math/vector3.cpp b/core/math/vector3.cpp
index f94f39b7f2b..dcb2ce8ef8a 100644
--- a/core/math/vector3.cpp
+++ b/core/math/vector3.cpp
@@ -138,7 +138,7 @@ bool Vector3::is_equal_approx(const Vector3 &p_v) const {
 }
 
 Vector3::operator String() const {
-	return "(" + String::num_real(x, false) + ", " + String::num_real(y, false) + ", " + String::num_real(z, false) + ")";
+	return "(" + String::num_real(x, true) + ", " + String::num_real(y, true) + ", " + String::num_real(z, true) + ")";
 }
 
 Vector3::operator Vector3i() const {
diff --git a/core/string/ustring.cpp b/core/string/ustring.cpp
index 5d998d22d41..f7f9e13f618 100644
--- a/core/string/ustring.cpp
+++ b/core/string/ustring.cpp
@@ -1425,7 +1425,11 @@ String String::num(double p_num, int p_decimals) {
 				if (buf[z] == '0') {
 					buf[z] = 0;
 				} else if (buf[z] == '.') {
-					buf[z] = 0;
+					if (z == 254) {
+						buf[z] = 0;
+					} else {
+						buf[z + 1] = '0';
+					}
 					break;
 				} else {
 					break;
diff --git a/tests/core/math/test_aabb.h b/tests/core/math/test_aabb.h
index 526972a82f1..6b9dd17dc8c 100644
--- a/tests/core/math/test_aabb.h
+++ b/tests/core/math/test_aabb.h
@@ -48,7 +48,7 @@ TEST_CASE("[AABB] Constructor methods") {
 
 TEST_CASE("[AABB] String conversion") {
 	CHECK_MESSAGE(
-			String(AABB(Vector3(-1.5, 2, -2.5), Vector3(4, 5, 6))) == "[P: (-1.5, 2, -2.5), S: (4, 5, 6)]",
+			String(AABB(Vector3(-1.5, 2, -2.5), Vector3(4, 5, 6))) == "[P: (-1.5, 2, -2.5), S: (4.0, 5.0, 6.0)]",
 			"The string representation should match the expected value.");
 }
 
diff --git a/tests/core/math/test_color.h b/tests/core/math/test_color.h
index 51c3bc8bdc8..42e1975bad8 100644
--- a/tests/core/math/test_color.h
+++ b/tests/core/math/test_color.h
@@ -140,7 +140,7 @@ TEST_CASE("[Color] Conversion methods") {
 			cyan.to_rgba64() == 0x0000'ffff'ffff'ffff,
 			"The returned 64-bit BGR number should match the expected value.");
 	CHECK_MESSAGE(
-			String(cyan) == "(0, 1, 1, 1)",
+			String(cyan) == "(0.0, 1.0, 1.0, 1.0)",
 			"The string representation should match the expected value.");
 }
 
diff --git a/tests/core/math/test_rect2.h b/tests/core/math/test_rect2.h
index 0b1106ac3cf..f306d0a9fdc 100644
--- a/tests/core/math/test_rect2.h
+++ b/tests/core/math/test_rect2.h
@@ -57,7 +57,7 @@ TEST_CASE("[Rect2] Constructor methods") {
 TEST_CASE("[Rect2] String conversion") {
 	// Note: This also depends on the Vector2 string representation.
 	CHECK_MESSAGE(
-			String(Rect2(0, 100, 1280, 720)) == "[P: (0, 100), S: (1280, 720)]",
+			String(Rect2(0, 100, 1280, 720)) == "[P: (0.0, 100.0), S: (1280.0, 720.0)]",
 			"The string representation should match the expected value.");
 }