Bar charts and time graphs · seed 1 · A4, ink-friendly. The answer key prints on its own page for grown-ups.
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Bar charts and time graphs

Mathematics · Data & Statistics · ages 8-9
Name ______________________   Date ____________

  1. Recorded temperatures are 13°C, 19°C, 22°C and 16°C. How many degrees separate the highest and lowest readings?

    Answer: ______________

  2. Temperature readings: 9am 12°C, noon 18°C, 3pm 21°C, 6pm 15°C. What was the recorded temperature at 6pm?

    • 18°C
    • 15°C
    • 21°C
    • 12°C

  3. What type of chart shows these favourite-colour votes?

    Red4Blue7Green2
    • Bar chart
    • Time graph
    • Tally chart

  4. For the time graphs in this lesson, time labels go along the bottom axis.

    Circle one:   True   False

  5. On a time axis, day 1 to day 2 takes one space. How many equal spaces should day 2 to day 5 take?

    Answer: ______________

  6. A plant was 3 cm tall in week 1 and 8 cm tall in week 2. How many centimetres did it grow?

    Answer: ______________

  7. A pond is 6 cm deep on Monday, 9 cm on Tuesday and 7 cm on Wednesday. What pattern should its joined points show?

    • Rise, then fall
    • Fall, then rise
    • Rise both times
    • Fall both times

  8. Readings were taken on days 1, 2 and 4. On a time axis, the gap from day 2 to day 4 should be twice the gap from day 1 to day 2.

    Circle one:   True   False

  9. Sam joins four friends' book counts with a line and calls it a time graph. The bottom labels are their names. Which explanation fits?

    • Friends' names mark times, so the line shows time change
    • Every friend's book count must be shown in a tally chart
    • Names mark people, so bars fit this comparison

  10. Mina draws separate bars for daily temperatures. Arun plots the same readings and joins them in day order. Which claim is fair?

    • Only Mina's bars can show each recorded daily temperature
    • Both show readings; Arun's line helps follow change
    • Only Arun's line can show each recorded daily temperature
    • Neither chart can show any recorded daily temperatures
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Answer key

For grown-ups. Fold this page away before handing over the rest.

Bar charts and time graphs W1-mt_ChjMU2GDJa-s1

  1. 9 · The highest is 22°C and the lowest is 13°C. Their difference is 22 - 13 = 9°C.
  2. 15°C · Match 6pm to its reading: 15°C.
  3. Bar chart · Each colour has a separate bar showing its vote count. This is a bar chart.
  4. True · Time goes along the bottom. The measured value and its units go up the side.
  5. 3 · Day 2 to day 5 is three daily gaps: 2 to 3, 3 to 4 and 4 to 5.
  6. 5 · Subtract the earlier height from the later height: 8 - 3 = 5 cm.
  7. Rise, then fall · The readings rise from 6 to 9, then fall from 9 to 7.
  8. True · The first gap is one day. The second is two days, so it needs twice the space.
  9. Names mark people, so bars fit this comparison · The labels name different people, not different times. A bar for each friend would show the comparison clearly.
  10. Both show readings; Arun's line helps follow change · Both displays can show readings at recorded times. Joined points help readers follow their time order.
Worksheet · LightMySky