lesson
Read the intervals carefully
1 · Learn
A line graph can show change over time. Read its axes, units and interval size before describing a rise or fall. A connecting line does not prove every value between measured points.
A timetable might list a bus leaving at 09:45 and arriving at 10:20. Its journey takes 35 minutes, not 75: clock minutes reset after 59.
Complete a timetable using the journey time. The 09:45 bus arrives at 10:20, taking 35 minutes. Another bus leaves at 09:55 and takes the same time. Five minutes reaches 10:00, then thirty more reaches 10:30. Enter 10:30 in its missing arrival cell; check by counting back 35 minutes.
2 · Worked example
The plant's recorded growth is 4 cm over days 1–3 and 1 cm over days 3–5. These equal two-day intervals make that comparison meaningful.
3 · Your turn
Using the height record, find the total recorded growth from day 1 to day 5. A bus leaves at 14:50 and arrives at 15:35; how long is the journey?
Check your answer
5 cm; 45 minutes.
4 · Apply your learning
Draw a labelled graph of the supplied height data and read an adult-provided timetable. Distinguish observations from unmeasured estimates.
Adult guidance and safety
Model the calculation or measurement before relying on a procedure. Explain estimates, units and checks. Use a ruler/protractor and suitable diagrams where needed; text examples alone do not establish practical skill or fluency.
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Check a calculation · Year 5 onward
Use this only when your teacher or adult allows a calculator for the task. Show your thinking first. It does not replace mental or written arithmetic and does not mark your lesson answer.
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