diff --git a/Rishita_greatestofthree_q7.py b/Rishita_greatestofthree_q7.py
new file mode 100644
index 0000000..84b5651
--- /dev/null
+++ b/Rishita_greatestofthree_q7.py
@@ -0,0 +1,9 @@
+num1 = int(input("Enter value: "))
+num2 = int(input("Enter value: "))
+num3 = int(input("Enter value: "))
+if num1 >= num2 and num1 >= num3:
+  print(num1)
+elif num2 >= num1 and num2 >= num3:
+  print(num2)
+else:
+  print(num3)
diff --git a/Rishita_greatestoftwo_q6.py b/Rishita_greatestoftwo_q6.py
new file mode 100644
index 0000000..8921888
--- /dev/null
+++ b/Rishita_greatestoftwo_q6.py
@@ -0,0 +1,6 @@
+n = int(input("Enter value: "))
+m = int(input("Enter value: "))
+if m > n:
+    print(m)
+else:
+    print(n)
\ No newline at end of file
diff --git a/Rishita_leapyear_q8.py b/Rishita_leapyear_q8.py
new file mode 100644
index 0000000..8de0bfb
--- /dev/null
+++ b/Rishita_leapyear_q8.py
@@ -0,0 +1,5 @@
+year = int(input("Enter year: "))
+if (year%400 == 0) or (year%4==0 and year%100!=0):
+    print("Leap Year")
+else:
+    print("Not a Leap Year")
\ No newline at end of file
diff --git a/Rishita_oddeven_q2.py b/Rishita_oddeven_q2.py
new file mode 100644
index 0000000..0e398cb
--- /dev/null
+++ b/Rishita_oddeven_q2.py
@@ -0,0 +1,5 @@
+num = int(input("Enter value:")) 
+if num % 2 == 0: 
+  print("Num is Even") 
+else: 
+  print("Num is Odd")
\ No newline at end of file
diff --git a/Rishita_positiveornegative_q1.py b/Rishita_positiveornegative_q1.py
new file mode 100644
index 0000000..2b78747
--- /dev/null
+++ b/Rishita_positiveornegative_q1.py
@@ -0,0 +1,6 @@
+num = int(input("Enter value: "))
+if num >=0:
+    result = "Positive" 
+else:
+    "Negative"
+print(result)
\ No newline at end of file
diff --git a/Rishita_primenumrange_q10.py b/Rishita_primenumrange_q10.py
new file mode 100644
index 0000000..b3a1cd7
--- /dev/null
+++ b/Rishita_primenumrange_q10.py
@@ -0,0 +1,10 @@
+low = int(input("range starts from: "))
+high = int(input("range ends upto: "))
+
+for num in range(low, high + 1):
+    if num > 1:
+        for i in range(2, num):
+            if (num % i) == 0:
+                break
+    else:        
+        print(num)
\ No newline at end of file
diff --git a/Rishita_primeornot_q9.py b/Rishita_primeornot_q9.py
new file mode 100644
index 0000000..b80e154
--- /dev/null
+++ b/Rishita_primeornot_q9.py
@@ -0,0 +1,11 @@
+num = int(input("Enter value: "))
+
+if num > 1:
+    for i in range(2, int(num**0.5) + 1):
+        if (num % i) == 0:
+            print(num, "is not a prime number.")
+            break
+    else:
+        print(num, "is a prime number.")
+else:
+    print(num, "is not a prime number.")
diff --git a/Rishita_reversenum_q12.py b/Rishita_reversenum_q12.py
new file mode 100644
index 0000000..703ee32
--- /dev/null
+++ b/Rishita_reversenum_q12.py
@@ -0,0 +1,9 @@
+num = int(input("Enter value: "))
+temp = num
+reverse = 0
+while num > 0:
+    rem = num % 10
+    reverse = (reverse * 10) + rem
+    num = num // 10
+
+print(reverse)
\ No newline at end of file
diff --git a/Rishita_sumfirstn_q3.py b/Rishita_sumfirstn_q3.py
new file mode 100644
index 0000000..7ac5de8
--- /dev/null
+++ b/Rishita_sumfirstn_q3.py
@@ -0,0 +1,5 @@
+n = int(input("Enter value: "))
+total = 0
+for i in range(1, n + 1):
+    total += i
+print("The sum of the first", n, "natural numbers is", total)
\ No newline at end of file
diff --git a/Rishita_sumofdigitsofnum_q11.py b/Rishita_sumofdigitsofnum_q11.py
new file mode 100644
index 0000000..aecc77b
--- /dev/null
+++ b/Rishita_sumofdigitsofnum_q11.py
@@ -0,0 +1,7 @@
+num = input("Enter value: ")
+sum = 0
+
+for i in num:
+    sum = sum + int(i)
+
+print("sum of the digits of num is", sum)
\ No newline at end of file
diff --git a/Rishita_sumofn_q4.py b/Rishita_sumofn_q4.py
new file mode 100644
index 0000000..5b5bbc1
--- /dev/null
+++ b/Rishita_sumofn_q4.py
@@ -0,0 +1,3 @@
+n = int(input("Enter value: "))
+sum = ((n*(n+1))*0.5)
+print("The sum of the first", n, "natural numbers is", sum)
\ No newline at end of file
diff --git a/Rishita_sumofnrange_q5.py b/Rishita_sumofnrange_q5.py
new file mode 100644
index 0000000..01b8bae
--- /dev/null
+++ b/Rishita_sumofnrange_q5.py
@@ -0,0 +1,6 @@
+num1 = 10
+num2 = 20
+sum = 0
+for i in range(num1,num2+1):
+  sum+=i
+print(sum)
\ No newline at end of file