diff --git a/pmd-exclude.properties b/pmd-exclude.properties
index b7bc6f074d02..1e7a09549aca 100644
--- a/pmd-exclude.properties
+++ b/pmd-exclude.properties
@@ -39,7 +39,6 @@ com.thealgorithms.dynamicprogramming.WineProblem=UselessParentheses
 com.thealgorithms.maths.BinomialCoefficient=UselessParentheses
 com.thealgorithms.maths.Complex=UselessParentheses
 com.thealgorithms.maths.DistanceFormulaTest=UnnecessaryFullyQualifiedName
-com.thealgorithms.maths.FibonacciJavaStreamsTest=BigIntegerInstantiation
 com.thealgorithms.maths.Gaussian=UselessParentheses
 com.thealgorithms.maths.GcdSolutionWrapper=UselessParentheses
 com.thealgorithms.maths.HeronsFormula=UselessParentheses
@@ -47,7 +46,7 @@ com.thealgorithms.maths.KaprekarNumbers=UselessParentheses
 com.thealgorithms.maths.KeithNumber=UselessParentheses
 com.thealgorithms.maths.LeonardoNumber=UselessParentheses
 com.thealgorithms.maths.LinearDiophantineEquationsSolver=UselessParentheses
-com.thealgorithms.maths.MatrixUtil=BigIntegerInstantiation,UselessParentheses
+com.thealgorithms.maths.MatrixUtil=UselessParentheses
 com.thealgorithms.maths.RomanNumeralUtil=UselessParentheses
 com.thealgorithms.maths.SecondMinMax=UselessParentheses
 com.thealgorithms.maths.SecondMinMaxTest=UnnecessaryFullyQualifiedName
diff --git a/src/main/java/com/thealgorithms/maths/FibonacciJavaStreams.java b/src/main/java/com/thealgorithms/maths/FibonacciJavaStreams.java
index 72bae57c27b0..84390860ccc4 100644
--- a/src/main/java/com/thealgorithms/maths/FibonacciJavaStreams.java
+++ b/src/main/java/com/thealgorithms/maths/FibonacciJavaStreams.java
@@ -22,7 +22,7 @@ public static Optional<BigDecimal> calculate(final BigDecimal index) {
             return Optional.of(BigDecimal.ZERO);
         }
 
-        if (index.compareTo(new BigDecimal(2)) < 0) {
+        if (index.compareTo(BigDecimal.TWO) < 0) {
             return Optional.of(BigDecimal.ONE);
         }
 
diff --git a/src/test/java/com/thealgorithms/maths/FibonacciJavaStreamsTest.java b/src/test/java/com/thealgorithms/maths/FibonacciJavaStreamsTest.java
index 2c81a6304d8f..5cfb304ae471 100644
--- a/src/test/java/com/thealgorithms/maths/FibonacciJavaStreamsTest.java
+++ b/src/test/java/com/thealgorithms/maths/FibonacciJavaStreamsTest.java
@@ -21,13 +21,13 @@ public void testWithNegativeIndexShouldThrowException() {
     public void testCheckTheFirst4SequenceElements() {
         checkElement(BigDecimal.ZERO, BigDecimal.ZERO);
         checkElement(BigDecimal.ONE, BigDecimal.ONE);
-        checkElement(new BigDecimal(2), BigDecimal.ONE);
-        checkElement(new BigDecimal(3), new BigDecimal(2));
+        checkElement(BigDecimal.TWO, BigDecimal.ONE);
+        checkElement(new BigDecimal(3), BigDecimal.TWO);
     }
 
     @Test
     public void testCheck10thSequenceElement() {
-        checkElement(new BigDecimal(10), new BigDecimal(55));
+        checkElement(BigDecimal.TEN, new BigDecimal(55));
     }
 
     @Test
diff --git a/src/test/java/com/thealgorithms/maths/MatrixUtilTest.java b/src/test/java/com/thealgorithms/maths/MatrixUtilTest.java
index f61ebe6a26cc..b954e6ff7511 100644
--- a/src/test/java/com/thealgorithms/maths/MatrixUtilTest.java
+++ b/src/test/java/com/thealgorithms/maths/MatrixUtilTest.java
@@ -11,20 +11,20 @@ class MatrixUtilTest {
     @Test
     void add() {
         final BigDecimal[][] matrix1 = {
-            {new BigDecimal(3), new BigDecimal(2)},
+            {new BigDecimal(3), BigDecimal.TWO},
             {BigDecimal.ZERO, BigDecimal.ONE},
         };
 
         final BigDecimal[][] matrix2 = {
             {BigDecimal.ONE, new BigDecimal(3)},
-            {new BigDecimal(2), BigDecimal.ZERO},
+            {BigDecimal.TWO, BigDecimal.ZERO},
         };
 
         final BigDecimal[][] actual = MatrixUtil.add(matrix1, matrix2).orElseThrow(() -> new AssertionError("Could not compute matrix!"));
 
         final BigDecimal[][] expected = {
             {new BigDecimal(4), new BigDecimal(5)},
-            {new BigDecimal(2), BigDecimal.ONE},
+            {BigDecimal.TWO, BigDecimal.ONE},
         };
 
         assertTrue(Objects.deepEquals(actual, expected));
@@ -37,7 +37,7 @@ void subtract() {
         };
 
         final BigDecimal[][] matrix2 = {
-            {new BigDecimal(2), BigDecimal.ZERO},
+            {BigDecimal.TWO, BigDecimal.ZERO},
             {new BigDecimal(-2), new BigDecimal(-3)},
         };
 
@@ -55,13 +55,13 @@ void subtract() {
     void multiply() {
 
         final BigDecimal[][] matrix1 = {
-            {BigDecimal.ONE, new BigDecimal(2), new BigDecimal(3)},
+            {BigDecimal.ONE, BigDecimal.TWO, new BigDecimal(3)},
             {new BigDecimal(4), new BigDecimal(5), new BigDecimal(6)},
             {new BigDecimal(7), new BigDecimal(8), new BigDecimal(9)},
         };
 
         final BigDecimal[][] matrix2 = {
-            {BigDecimal.ONE, new BigDecimal(2)},
+            {BigDecimal.ONE, BigDecimal.TWO},
             {new BigDecimal(3), new BigDecimal(4)},
             {new BigDecimal(5), new BigDecimal(6)},
         };