Representing and understanding algorithms

Identify the correct definition for ‘algorithm’. (1-2)

• A problem

• A solution to a problem

• The steps that are taken to solve a problem

• The words to enter when typing

Identify the purpose of the following flowchart symbol: (1-2)

• Input / Output

• Output

• Start / Stop

• Decision

Identify the purpose of the following flowchart symbol: (1-2)

• Input / Output

• Sub Process

• Process

• Decision

Identify the purpose of the following flowchart symbol: (1-2)

• Input / Output

• Sub Process

• Process

• Decision

Identify the purpose of the following flowchart symbol: (1-2)

• Process

• Sub Process

• Input / Output

• Decision

Identify the purpose of the following flowchart symbol: (1-2)

• Process

• Sub Process

• Input / Output

• Decision

How many arrows should come out of a decision symbol in a flowchart?

• 0

• 1

• 2

• 3

The following algorithm should take as input and add together two numbers, outputting the result.

Identify the correct algorithm. (4-5)

• num1 = input(“Enter the first number”)

  num2 – input(“Enter the second number”)

  num3 = num1 + num2

  print(num3)

• num1 = input(“Enter the first number”)

  num2 = input(“Enter the second number”)

  num3 = num1 + num2

  print(num3)

• num1 = input(“Enter the first number”)

  num3 = input(“Enter the second number”)

  num3 = num1 + num2

  print(num3)

• num1 = input(“Enter the first number”)

  num2 = input(“Enter the second number”)

  num3 = num1 + num2

  print(num2)

The following algorithm should take as input on number, and output the 12 times table for that number. Identify the correct algorithm. (9)

• number = input(“Enter a number”)

  for x = 1 to 12

  print(number * x)

  next x

• number = input(“Enter a number”)

  for x = 0 to 12

  print(number * x)

  next x

• number = input(“Enter a number”)

  for x = 1 to 12

  print(number X x)

  next x

• number = input(“Enter a number”)

  for x = 1 to 12

  print(number * number)

  next x

The following algorithm should take as input two numbers, add them together, multiply the answer by 11, add 4, then divide by 2. It should output the result. Identify the correct algorithm. (9)

• number = input(“Enter a number”)

  number = input(“Enter the second number”)

  final = (((number + number) * 11) + 4) / 2

  print (final)

• number = input(“Enter a number”)

  number2 = input(“Enter the second number”)

  final = (((number + number2) * 11) + 4) * 2

  print (final)

• number = input(“Enter a number”)

  number2 = input(“Enter the second number”)

  final = number + number2 +4 *11 / 2

  print (final)

• number = input(“Enter a number”)

  number2 = input(“Enter the second number”)

  final = (((number + number2) * 11) + 4) / 2

  print (final)