diff --git a/src/addition.c b/src/addition.c
index 0b864a9..d43de60 100644
--- a/src/addition.c
+++ b/src/addition.c
@@ -114,4 +114,9 @@ float addition_float(float number1, float number2) {
 unsigned long sign_double(unsigned long a) {
     if (a & 0x8000000000000000 == 0x8000000000000000) return 1;
     else return 0;
+}
+
+unsigned long precision_double(unsigned long a) {
+    a &= 0x000fffffffffffff;
+    return a;
 }
\ No newline at end of file
diff --git a/src/addition.h b/src/addition.h
index 89a0297..c770bd8 100644
--- a/src/addition.h
+++ b/src/addition.h
@@ -25,4 +25,6 @@ float addition_float(float number1, float number2);
 
 unsigned long sign_double(unsigned long a);
 
+unsigned long precision_double(unsigned long a);
+
 #endif // ADDITION_H
\ No newline at end of file