diff --git a/brain_games/calc_game.py b/brain_games/calc_game.py
index ea603ad..49628f5 100644
--- a/brain_games/calc_game.py
+++ b/brain_games/calc_game.py
@@ -5,102 +5,62 @@
 import prompt
 from cli import greet_first, welcome_user
 
-
-def calc_greet_first():
-    """First greeting message."""
-    print('What is the result of the expression?\n')
-
-
-def calc_game_summ():
-    """Summary operation."""
-    number1 = random.randint(0, 100)
-    number2 = random.randint(0, 100)
-    summ_result = number1 + number2
-    return summ_result, number1, number2
+OPERATIONS = {
+    'summation': ('+', lambda x, y: x + y),
+    'subtraction': ('-', lambda x, y: x - y),
+    'multiplication': ('*', lambda x, y: x * y),
+}
 
 
-def summ_check():
-    """Check calculation of summary by user."""
-    answer_sum, number1, number2 = calc_game_summ()
-    question_sum = prompt.string('Question: ' + str(number1) + ' + ' + str(number2) + '\n')
-    if question_sum == str(answer_sum):
-        print('Your answer: ' + question_sum)
-        print('Correct!')
-        return True
-    print("'" + str(question_sum) + "' " + "is wrong answer ;(. Correct answer was " + "'" + str(answer_sum) + "'")
-    return False
+def get_random_numbers():
+    return random.randint(0, 100), random.randint(0, 100)
 
 
-def calc_game_subtract():
-    """Subtract operation."""
-    number3 = random.randint(0, 100)
-    number4 = random.randint(0, 100)
-    answer_subtr = number3 - number4
-    return answer_subtr, number3, number4
+def generate_question(operation):
+    symbol, _ = OPERATIONS[operation]
+    num1, num2 = get_random_numbers()
+    return f'Question: {num1} {symbol} {num2}\n', num1, num2
 
 
-def subtract_check():
-    """Check calculation of substract by user."""
-    answer_subtr, number3, number4 = calc_game_subtract()
-    question_subtr = prompt.string('Question: ' + str(number3) + ' - ' + str(number4) + '\n')
-    if question_subtr == str(answer_subtr):
-        print('Your answer: ' + question_subtr)
+def check_answer(question, answer, correct_answer):
+    if answer == str(correct_answer):
+        print(f'Your answer: {answer}')
         print('Correct!')
         return True
-    print("'" + str(question_subtr) + "' " + "is wrong answer ;(. Correct answer was " + "'" + str(answer_subtr) + "'")
+    print(f"'{answer}' is wrong answer ;(. Correct answer was '{correct_answer}'")
     return False
 
 
-def calc_game_multiplication():
-    """Multiplication operation."""
-    number5 = random.randint(0, 10)
-    number6 = random.randint(0, 10)
-    answer_mult = number5 * number6
-    return answer_mult, number5, number6
-
-
-def multiplication_check():
-    """Check calculation of multiplication by user."""
-    answer_mult, number5, number6 = calc_game_multiplication()
-    question_mult = prompt.string('Question: ' + str(number5) + ' * ' + str(number6) + '\n')
-    if question_mult == str(answer_mult):
-        print('Your answer: ' + question_mult)
-        print('Correct!')
-        return True
-    print("'" + str(question_mult) + "' " + "is wrong answer ;(. Correct answer was " + "'" + str(answer_mult) + "'")
-    return False
+def play_game(operation):
+    question, num1, num2 = generate_question(operation)
+    correct_answer = OPERATIONS[operation][1](num1, num2)
+    user_answer = prompt.string(question)
+    return check_answer(question, user_answer, correct_answer)
 
 
 def user_fail_message(name):
-    """Report fail to user."""
-    print("Let's try again, ", name, '!', sep='')
+    print(f"Let's try again, {name}!")
 
 
 def calc_game_logic(name):
-    """Calc game logic function."""
     counter = 1
     while counter <= 3:
-        if summ_check() is False:
-            user_fail_message(name)
-            break
-        elif subtract_check() is False:
-            user_fail_message(name)
-            break
-        elif multiplication_check() is False:
-            user_fail_message(name)
-            break
-        elif counter == 3:
-            print('Congratulations, ', name, '!', sep='')
+        operations = list(OPERATIONS.keys())
+        for operation in operations:
+            if not play_game(operation):
+                user_fail_message(name)
+                return
+        if counter == 3:
+            print(f'Congratulations, {name}!')
         counter += 1
 
 
 def main():
-    """Run brain-calc game."""
     greet_first()
-    calc_greet_first()
+    print('What is the result of the expression?\n')
     name = welcome_user()
     calc_game_logic(name)
 
 
 if __name__ == '__main__':
-    main()
\ No newline at end of file
+    main()