Represent Each Measurement on a Line Plot
Read each supplied whole-unit length and place one mark above its number.
About 15 minutes, plus any extended practice
Supplied materials
- Paper and a pencil; drawing and spoken explanations are welcome. An adult may read directions and options aloud.
- Supplied worked-case record: For lengths 2,3,3,4,4,4 cm, place one mark at 2, two at 3, and three at 4.
- All quantities and shape descriptions are supplied in the worked example and questions; no purchase or personal information is needed.
Learn the idea
A line plot keeps repeated observations. Place one mark above the number matching each measurement, stacking marks when a value repeats. A stack of three marks is three measurements, not a longer measurement. The horizontal unit records length while the vertical stack records frequency.
Read each supplied whole-unit length and place one mark above its number. Count the complete marks to check that every measurement appears once. Answer how many observations have the requested value by counting its stack.
Place one mark per observation, including repeats. Stack height counts frequency, not measured length. Use an equally spaced whole-number line and stack repeated marks.
- Use an equally spaced whole-number line and stack repeated marks.
- Follow the worked example. Point to each number or shape feature and say what it tells you.
- Read each supplied whole-unit length and place one mark above its number.
- Try the question and then the three practice questions. Check your answers and explain any change you make.
See the method in action
For lengths 2,3,3,4,4,4 cm, place one mark at 2, two at 3, and three at 4. Six marks represent six measurements. The tallest stack is at four centimeters, meaning that length occurred three times, not that any object measured twelve centimeters. Place one mark per observation, including repeats. Stack height counts frequency, not measured length. Use an equally spaced whole-number line and stack repeated marks.
Check your reasoning
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Helpful tips
- Place one mark per observation, including repeats.
- Stack height counts frequency, not measured length.
See the answer and explanation
2
Count every occurrence of the requested measurement. The result is 2.
Take it further
Plot 6,6,7,8,8 cm. Expected stacks: two at 6, one at 7, two at 8.
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More practice: try new cases
Choose an answer for each problem. Explain your method on paper, then use the feedback to decide what to revisit.
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