diff --git a/maths/binary_to_Decimal_conversion.ts b/maths/binary_to_Decimal_conversion.ts
new file mode 100644
index 00000000..fc52cb9d
--- /dev/null
+++ b/maths/binary_to_Decimal_conversion.ts
@@ -0,0 +1,22 @@
+/**
+ * @function binaryToDecimal
+ * @description Convert the  binary to decimal .
+ * @param {number} binary - The input string
+ * @return {string} -  decimal of binary.
+ * @example binaryToDecimal('1011') = 11
+ * @example binaryToDecimal('1110') = 14
+ */
+
+function binaryToDecimal(binary: string): number {
+  let decimal: number = 0;
+  let power: number = 0;
+  for (let i = binary.length - 1; i >= 0; i--) {
+    if (binary[i] === '1') {
+      decimal += Math.pow(2, power);
+    }
+    power++;
+  }
+  return decimal;
+}
+
+
diff --git a/maths/prime_check.ts b/maths/prime_check.ts
new file mode 100644
index 00000000..8696948b
--- /dev/null
+++ b/maths/prime_check.ts
@@ -0,0 +1,27 @@
+/*
+ * @function isPrime
+ * @description program to check if a number is prime or not
+ * @see [Prime Check](https://www.programiz.com/javascript/examples/prime-number)
+ * @example Prime Number -> 5,7,11,13,17
+ * @param {num} number
+ */
+
+function isPrime(num: number): boolean {
+    if (num <= 1) {
+      return false;
+    }
+    for (let i = 2; i <= Math.sqrt(num); i++) {
+      if (num % i === 0) {
+        return false;
+      }
+    }
+    return true;
+  }
+  
+
+const num: number = 17;
+if (isPrime(num)) {
+  console.log(`${num} is prime`);
+} else {
+  console.log(`${num} is not prime`);
+}