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Grade 6 Computer Science — Repeating with loops

Read a loop, work out how many times it runs, and follow the value it builds up to the end.

Name: ________________________

  1. 1.Follow this code by hand. What is total at the end?

    total = 0
for i in range(0, 4):
    total = total + 6

  2. 2.A program sets a total to 100. It repeats this 5 times: take 20 away from the total. What is the total at the end?

  3. 3.A program sets a number to 2, then doubles it three times over. Put the values the number holds in order, from the start to the end.

    • 2
    • 8
    • 4
    • 16

  4. 4.Each of these starts a total at 0. Match each loop to the total it ends with.

    • Repeat 3 times: add 5
    • Repeat 4 times: add 5
    • Repeat 3 times: add 7
    • Repeat 2 times: add 9
    • Repeat 5 times: add 2
    • 21
    • 20
    • 15
    • 18
    • 10

  5. 5.A program repeats this 6 times: print a star. How many stars are printed?

  6. 6.A program sets a total to 0. It repeats this 3 times: add 8 to the total. What is the total at the end?

    • a) 11
    • b) 8
    • c) 3
    • d) 24

  7. 7.A program sets a number to 3. It repeats this 3 times: double the number. What is the number at the end?

  8. 8.A program sets a total to 0. It repeats this 3 times: add 10 to the total. What is the total at the end?

Answer key — Grade 6 Computer Science — Repeating with loops

  1. 1. 24
  2. 2. 0
  3. 3. 1. 2 2. 4 3. 8 4. 16
  4. 4. Repeat 3 times: add 5 → 15; Repeat 4 times: add 5 → 20; Repeat 3 times: add 7 → 21; Repeat 2 times: add 9 → 18; Repeat 5 times: add 2 → 10
  5. 5. 6
  6. 6. d) 24
  7. 7. 24
  8. 8. 30